./3 > the reset key-combinaison doesn't work because all interrupts are redirected (except auto-int 3).
I'll try to think about an escape key for the next version
The beta-test is public, if you find bugs on things that are already implemented and supposed to work, you can report them on this topic (bugs in the CPU or PPU for example). However, the v0.2 will surely crash with other games, but you can still make your own roms though (compatible nes roms, ie mapper 1 games such as Bomberman1, Donkey Kong 1, SMB1, Arkanoid for example) simply by applying ttbin2oth on the original .nes file.
For the screen issue, I really don't know yet. Maybe a real time scrolling system of the nes screen on the calc screen during the game, or a zoom of the nes screen that would fit on a 240x128/160x100 one.