Thanks for this thread!
A small bug report:
When disabling that app's are allowed to synchronize while roaming, they're supposed to "ask" whether they can use the internet or not. This popup dialogue never appears, but is hidden in the background. This seems to be a problem with other popups too.
Oh, and adding
to startup.txt made the touch screen (much) more accurate for me.
EDIT: in the "set cmdline"