I downloaded image files from @LoneTech and manage to work with it.
This is my first time to work with qemu and I struggled a bit with segmentation fault. In Ubuntu 10.10, it is necessary to add '-m 256' option.
So to change hotkey of poterm, just change line 90 of poterm.cpp
case KEY_DELETE -> case KEY_MENU
and in file "Term.cpp" change the line 427
"DEL: Rotate" to "MENU: Rotate"
with this I can rotate the poterm with Menu key.