Try out DSDoom and the shareware WAD. The turning on that is just right, and something similar to that with Duke3DS would be just super.
It's just annoying wanting to turn a tiny bit (And just tapping slightly on the D-Pad) and end up turning 180 [insert degrees sign]--I die almost immediately because of this.
EDIT: Stylus control is good though. All we need is: the ability to pause, map shoot to L and jump and stuff to touch screen buttons, and if you can, better sound, even with sound like this though it is awesome.