This might be of use, but requires more investigation.
tail -F /var/log/Xorg.0.log
touch and release one finger:
[ 84199.776] (II) [GestureEngine] Sending button : 1 down
[ 84199.906] (II) [GestureEngine] Sending button : 1 up
2 fingers:
[ 84307.039] (II) [GestureEngine] Sending button : 1 down
[ 84307.039] (II) [GestureEngine] Sending button : 2 down
[ 84307.321] (II) [GestureEngine] Sending button : 2 up
[ 84307.322] (II) [GestureEngine] Sending button : 1 up
slide one finger up:
[ 84245.921] (II) [GestureEngine] Sending button : 1 down
[ 84246.023] (II) [GestureEngine] Sending button : 3 down
[ 84246.023] (II) [GestureEngine] Sending button : 3 up
[ 84246.220] (II) [GestureEngine] Sending button : 1 up
down:
[ 84374.550] (II) [GestureEngine] Sending button : 1 down
[ 84374.577] (II) [GestureEngine] Sending button : 4 down
[ 84374.577] (II) [GestureEngine] Sending button : 4 up
[ 84374.740] (II) [GestureEngine] Sending button : 1 up
left:
[ 84406.672] (II) [GestureEngine] Sending button : 1 down
[ 84406.700] (II) [GestureEngine] Sending button : 5 down
[ 84406.701] (II) [GestureEngine] Sending button : 5 up
[ 84406.827] (II) [GestureEngine] Sending button : 1 up
right:
[ 84431.128] (II) [GestureEngine] Sending button : 1 down
[ 84431.154] (II) [GestureEngine] Sending button : 6 down
[ 84431.155] (II) [GestureEngine] Sending button : 6 up
[ 84431.268] (II) [GestureEngine] Sending button : 1 up
2 fingers small pinch (slide together):
[ 84583.599] (II) [GestureEngine] Sending button : 1 down
[ 84583.599] (II) [GestureEngine] Sending button : 2 down
[ 84583.713] (II) [GestureEngine] Sending button : 7 down
[ 84583.714] (II) [GestureEngine] Sending button : 7 up
[ 84583.758] (II) [GestureEngine] Sending button : 7 down
[ 84583.759] (II) [GestureEngine] Sending button : 7 up
[ 84583.891] (II) [GestureEngine] Sending button : 7 down
[ 84583.891] (II) [GestureEngine] Sending button : 7 up
[ 84583.921] (II) [GestureEngine] Sending button : 2 up
[ 84583.921] (II) [GestureEngine] Sending button : 1 up
2 fingers small stretch (slide apart):
[ 84637.818] (II) [GestureEngine] Sending button : 1 down
[ 84637.818] (II) [GestureEngine] Sending button : 2 down
[ 84638.052] (II) [GestureEngine] Sending button : 8 down
[ 84638.053] (II) [GestureEngine] Sending button : 8 up
[ 84638.112] (II) [GestureEngine] Sending button : 8 down
[ 84638.113] (II) [GestureEngine] Sending button : 8 up
[ 84638.171] (II) [GestureEngine] Sending button : 8 down
[ 84638.171] (II) [GestureEngine] Sending button : 8 up
[ 84638.200] (II) [GestureEngine] Sending button : 8 down
[ 84638.201] (II) [GestureEngine] Sending button : 8 up
[ 84638.230] (II) [GestureEngine] Sending button : 2 up
[ 84638.230] (II) [GestureEngine] Sending button : 1 up
touch, tap home button, release:
[ 86153.814] (II) [GestureEngine] Sending button : 1 down
[ 86154.314] (II) [GestureEngine] Sending button : 9 down
[ 86154.315] (II) [GestureEngine] Sending button : 9 up
[ 86156.072] (II) [GestureEngine] Sending button : 1 up
large pinch:
[ 84735.253] (II) [GestureEngine] Sending button : 1 down
[ 84735.381] (II) [GestureEngine] Sending button : 2 down
[ 84735.503] (II) [GestureEngine] Sending button : 7 down
[ 84735.503] (II) [GestureEngine] Sending button : 7 up
[ 84735.532] (II) [GestureEngine] Sending button : 7 down
[ 84735.533] (II) [GestureEngine] Sending button : 7 up
[ 84735.547] (II) [GestureEngine] Sending button : 7 down
[ 84735.548] (II) [GestureEngine] Sending button : 7 up
[ 84735.577] (II) [GestureEngine] Sending button : 7 down
[ 84735.578] (II) [GestureEngine] Sending button : 7 up
[ 84735.578] (II) [GestureEngine] Sending button : 7 down
[ 84735.579] (II) [GestureEngine] Sending button : 7 up
[ 84735.593] (II) [GestureEngine] Sending button : 7 down
[ 84735.593] (II) [GestureEngine] Sending button : 7 up
[ 84735.608] (II) [GestureEngine] Sending button : 7 down
[ 84735.609] (II) [GestureEngine] Sending button : 7 up
[ 84735.622] (II) [GestureEngine] Sending button : 7 down
[ 84735.622] (II) [GestureEngine] Sending button : 7 up
[ 84735.637] (II) [GestureEngine] Sending button : 7 down
[ 84735.638] (II) [GestureEngine] Sending button : 7 up
[ 84735.653] (II) [GestureEngine] Sending button : 7 down
[ 84735.653] (II) [GestureEngine] Sending button : 7 up
[ 84735.654] (II) [GestureEngine] Sending button : 7 down
[ 84735.654] (II) [GestureEngine] Sending button : 7 up
[ 84735.655] (II) [GestureEngine] Sending button : 7 down
[ 84735.655] (II) [GestureEngine] Sending button : 7 up
[ 84735.681] (II) [GestureEngine] Sending button : 7 down
[ 84735.681] (II) [GestureEngine] Sending button : 7 up
[ 84735.694] (II) [GestureEngine] Sending button : 7 down
[ 84735.694] (II) [GestureEngine] Sending button : 7 up
[ 84735.709] (II) [GestureEngine] Sending button : 7 down
[ 84735.709] (II) [GestureEngine] Sending button : 7 up
[ 84735.724] (II) [GestureEngine] Sending button : 7 down
[ 84735.724] (II) [GestureEngine] Sending button : 7 up
[ 84735.738] (II) [GestureEngine] Sending button : 7 down
[ 84735.738] (II) [GestureEngine] Sending button : 7 up
[ 84735.753] (II) [GestureEngine] Sending button : 7 down
[ 84735.753] (II) [GestureEngine] Sending button : 7 up
[ 84735.782] (II) [GestureEngine] Sending button : 7 down
[ 84735.783] (II) [GestureEngine] Sending button : 7 up
[ 84735.827] (II) [GestureEngine] Sending button : 7 down
[ 84735.827] (II) [GestureEngine] Sending button : 7 up
[ 84735.858] (II) [GestureEngine] Sending button : 7 down
[ 84735.859] (II) [GestureEngine] Sending button : 7 up
[ 84736.019] (II) [GestureEngine] Sending button : 2 up
[ 84736.020] (II) [GestureEngine] Sending button : 1 up
large stretch:
[ 84785.977] (II) [GestureEngine] Sending button : 1 down
[ 84785.977] (II) [GestureEngine] Sending button : 2 down
[ 84786.123] (II) [GestureEngine] Sending button : 8 down
[ 84786.124] (II) [GestureEngine] Sending button : 8 up
[ 84786.138] (II) [GestureEngine] Sending button : 8 down
[ 84786.139] (II) [GestureEngine] Sending button : 8 up
[ 84786.153] (II) [GestureEngine] Sending button : 8 down
[ 84786.154] (II) [GestureEngine] Sending button : 8 up
[ 84786.168] (II) [GestureEngine] Sending button : 8 down
[ 84786.168] (II) [GestureEngine] Sending button : 8 up
[ 84786.169] (II) [GestureEngine] Sending button : 8 down
[ 84786.169] (II) [GestureEngine] Sending button : 8 up
[ 84786.184] (II) [GestureEngine] Sending button : 8 down
[ 84786.185] (II) [GestureEngine] Sending button : 8 up
[ 84786.185] (II) [GestureEngine] Sending button : 8 down
[ 84786.186] (II) [GestureEngine] Sending button : 8 up
[ 84786.199] (II) [GestureEngine] Sending button : 8 down
[ 84786.199] (II) [GestureEngine] Sending button : 8 up
[ 84786.214] (II) [GestureEngine] Sending button : 8 down
[ 84786.214] (II) [GestureEngine] Sending button : 8 up
[ 84786.215] (II) [GestureEngine] Sending button : 8 down
[ 84786.215] (II) [GestureEngine] Sending button : 8 up
[ 84786.228] (II) [GestureEngine] Sending button : 8 down
[ 84786.229] (II) [GestureEngine] Sending button : 8 up
[ 84786.242] (II) [GestureEngine] Sending button : 8 down
[ 84786.242] (II) [GestureEngine] Sending button : 8 up
[ 84786.256] (II) [GestureEngine] Sending button : 8 down
[ 84786.256] (II) [GestureEngine] Sending button : 8 up
[ 84786.271] (II) [GestureEngine] Sending button : 8 down
[ 84786.271] (II) [GestureEngine] Sending button : 8 up
[ 84786.286] (II) [GestureEngine] Sending button : 8 down
[ 84786.286] (II) [GestureEngine] Sending button : 8 up
[ 84786.300] (II) [GestureEngine] Sending button : 8 down
[ 84786.300] (II) [GestureEngine] Sending button : 8 up
[ 84786.315] (II) [GestureEngine] Sending button : 8 down
[ 84786.315] (II) [GestureEngine] Sending button : 8 up
[ 84786.332] (II) [GestureEngine] Sending button : 8 down
[ 84786.332] (II) [GestureEngine] Sending button : 8 up
[ 84786.374] (II) [GestureEngine] Sending button : 8 down
[ 84786.374] (II) [GestureEngine] Sending button : 8 up
[ 84786.448] (II) [GestureEngine] Sending button : 8 down
[ 84786.448] (II) [GestureEngine] Sending button : 8 up
[ 84786.567] (II) [GestureEngine] Sending button : 8 down
[ 84786.567] (II) [GestureEngine] Sending button : 8 up
[ 84786.611] (II) [GestureEngine] Sending button : 2 up
[ 84786.611] (II) [GestureEngine] Sending button : 1 up
touch, pinch, stretch, pinch, stretch, release:
[ 85406.271] (II) [GestureEngine] Sending button : 1 down
[ 85406.272] (II) [GestureEngine] Sending button : 2 down
[ 85406.372] (II) [GestureEngine] Sending button : 7 down
[ 85406.373] (II) [GestureEngine] Sending button : 7 up
[ 85406.402] (II) [GestureEngine] Sending button : 7 down
[ 85406.403] (II) [GestureEngine] Sending button : 7 up
[ 85406.432] (II) [GestureEngine] Sending button : 7 down
[ 85406.433] (II) [GestureEngine] Sending button : 7 up
[ 85406.477] (II) [GestureEngine] Sending button : 7 down
[ 85406.478] (II) [GestureEngine] Sending button : 7 up
[ 85406.478] (II) [GestureEngine] Sending button : 7 down
[ 85406.479] (II) [GestureEngine] Sending button : 7 up
[ 85406.520] (II) [GestureEngine] Sending button : 7 down
[ 85406.520] (II) [GestureEngine] Sending button : 7 up
[ 85406.773] (II) [GestureEngine] Sending button : 8 down
[ 85406.773] (II) [GestureEngine] Sending button : 8 up
[ 85406.803] (II) [GestureEngine] Sending button : 8 down
[ 85406.803] (II) [GestureEngine] Sending button : 8 up
[ 85406.832] (II) [GestureEngine] Sending button : 8 down
[ 85406.833] (II) [GestureEngine] Sending button : 8 up
[ 85406.876] (II) [GestureEngine] Sending button : 8 down
[ 85406.877] (II) [GestureEngine] Sending button : 8 up
[ 85407.026] (II) [GestureEngine] Sending button : 7 down
[ 85407.026] (II) [GestureEngine] Sending button : 7 up
[ 85407.054] (II) [GestureEngine] Sending button : 7 down
[ 85407.054] (II) [GestureEngine] Sending button : 7 up
[ 85407.084] (II) [GestureEngine] Sending button : 7 down
[ 85407.084] (II) [GestureEngine] Sending button : 7 up
[ 85407.370] (II) [GestureEngine] Sending button : 8 down
[ 85407.371] (II) [GestureEngine] Sending button : 8 up
[ 85407.410] (II) [GestureEngine] Sending button : 8 down
[ 85407.410] (II) [GestureEngine] Sending button : 8 up
[ 85407.479] (II) [GestureEngine] Sending button : 8 down
[ 85407.480] (II) [GestureEngine] Sending button : 8 up
[ 85407.625] (II) [GestureEngine] Sending button : 2 up
[ 85407.625] (II) [GestureEngine] Sending button : 1 up
Interesting? I think so.
Please let me know if you find any other gestures. Thanks!