Little wishlist for next yabause version:
- propper window size, currently it's always 320x224, no matter what the Saturn res is (bad for screenshots)
- correct full screen display, only upper part is displayed, plus the window menu bar
- changing the ISO file requires a restart (settings to the init file should have immediate effect)
- better button mapping, with my keyboard keys are at different locations than you assumed
- how do I get to know which frameskip is active?
- is there a built-in screenshot function?
Just some suggestions in order of usefulness for my personal usage.