Hi Tom. I am glad you are liking shapesynth. I was going to answer your palm sounds comment, but lets do it here instead.
They sound like good ideas. I'll see if I can find an old 3.1.3 sdk, apple seem to want to push developers towards the newer versions. But, it should be possible, I think.
As for memory and graphics we should definitely try that out. If you want to send me your email, humble [at] humbletune (DOT) com, I can invite you to testflightapp.com for BETA testing, if you want!? 🙂