Using Arculator for fault finding

Has anyone used Arculator for fault finding in code?

I’ve tried to use the debugger feature. It’s a really useful tool, although restricted by two omissions:

1. You can’t change register values on the fly
2. You can’t arbitrarily break into the code after you’ve set it running

You can sort of work around the last point by turning the debugger off/on, but if you’re trying to time your break its a problem.

EDIT: You also can’t tell it to skip over IRQ’s and OS code so you end up continually in either an IRQ handler or the OS.