I just did a quick test on this during my dinner break haha. I tried superfrog and stunt car racer. Superfrog worked fine...apart from the fact you have to press up to jump lol however Stunt car racer wouldnt work. Please done take this as a bug on your part as like i say was a quick test and might be me at fault.

Would be great if we could control the menu and some of the short cuts via the gamegrippers extra buttons as i can already see it being a pain having to flip gripper on and off lol but thanks for the qudos of showing my mates superfrog on my phone haha oh how the all want it now haa