your app is very cool. It is an awesome idea to do palm rejection throw software. Seems to me that tegra 4 is doing something similar combined with a 200 mhz screen. there are also a lot of bluetooth stylus for ipad but i don't know any for android and because your idea is the closest we have, i would like to ask you if you could continue with your project and try to improve your palm rejection and maybe do a fundraiser.
it would be cool to combine your app with a bluetooth stylus to get more accuracy and virtually to every android tablet(i know that this is probably asking too much but I would contribute)