App2sd - why
App development manager here. We didn't originally have app2sd because it wasn't introduced until 2.2. We had to disable use support for 2.1 and below to get this working.
Regarding the Transformer issue, we're releasing a fix for this any moment now. It's a matter of the X Y and Z axis being different on Honeycomb tablets. We can only really test on our Galaxy Tab 10.1 so any feedback on how it works in other tablets would be welcome!
Here's a little bit of info about the issue from Google