Excellent work, Peter. Just one suggestion / wish: copy&paste with mouse (if it isn't implemented, I can't remember now).
it'll probably be much slower on machines which lack fastram. The current rendering code uses 040/060 instructions in some screen modes, which definitely prevents it from working on lower spec
Maybe you know, maybe not, but if you refer to move16, it's not the fastest / most effective instruction for 060. IIRC, it has its benefits only for 040, for 060 is still faster to use movem.