Emulating the Commodore 65 with a low-level approach is not "accurate" and it's more than pedantic: it's a self-defeating task.
That's funny, I'll have to tell the makers of VICE, UAE, bsnes, DOSBox, Stella, etc, etc. that hardware-level emulation is a self-defeating task.
The problems you see with the C65 support are because nobody "on staff" knows anything about the machine, so we are unable to fix it. If you do, you know how to send us patches