Nope, you're facing the present truth.
The T1 has 2.2.1 - just go to Settings -> About (not Sony Settings, but Android Settings after rooting)
In Settings -> Applications you'll also find a button for moving apps to SD which doesn't work either.
But if you find a solution, please post it to the wiki
https://wiki.mobileread.com/wiki/PRST...Apps_to_sdcard