[RotarySMP]

Nice work Jon. This is a very similar configuration to Dave K (the author of TurboCNC).

Yes TurboCNC does tool offsets. Same code - M06 T01. You will need to have a line before to get you clear of the work (say G00 X60 Z20) as TuboCNC won't automatically go to a defined tool change location.

You will want to use V4, as it has separate offset registers for tools and part offsets. The description of how to set up your tooling file is on Page 17 of the V4 Manual.