Thank you for the very detailed reply! I completed 1).
Regarding my 2nd request though, I am changing:
@screensize = (DEFAULTSCREENZOOM.floor).to_i # 0=half size, 1=full size, 2=double size to @screensize = 1 # 0=half size, 1=full size, 2=double size
But nothing changes, I also tried 2 and...