Another idea for you:
When I turn off the LCD with the 3 key while playing music, it'd be nice if the touch screen was also disabled. You could make it an option for those who don't like that idea. I've inadvertently touched the screen in the top right-hand corner, putting the program into input mode, all while the LCD was off. I had to turn my Z off to get the screen back on, since pressing 4 put a 4 in the text box rather than turning the LCD back on.
This happened to me in my car, which is usually where I'm playing music. The Z sits on the passenger seat with the screen open. If I pick it up wrong, say at a stop light to see what's playing, this can happen.
Again, I put in a ticket at Katastrophos as an enhancement, but I thought I'd repeat it here.
Asterix