I guess this isn't an issue on iOs, but a bit more so on Android, and especially for me who has an Xperia Play.
Would be good to a) be able to take input from hardware keys and b) capture certain events/keys such as the back button and have that go to menu instead of exit the game, for instance (or the other way around if that's desirable).
Some info on the extra buttons on Xperia Play: http://blogs.sonyericsson.com/wp/2011/02/13/xperia-play-game-keys/
Sony seems very interested in supporting games that are "Play Optimized" and it's also a great gaming device, so could be interesting to support, if nothing else just by allowing to read the presses and maybe a link to the guide.
If you have some specific stress tests you would like to run I'd be happy to throw them at my phone.