Thanks for testing.

BT switching (not or yes) is already in my thoughts. I can do something very simple:
- If you exit via the menu (File -> exit) it is turned off;
- If you exit by closing the app (x), it is not disabled;
Or I will put this option in a configuration file (changeable or not via menu).
I'll see what I can do.

For graphics, at least for now, I'm not going to venture.