Ah, so there is direct indexing support. Makes perfect sense. I should have done a more exhaustive search before my posting, so my apologies to all for asking the same question again.
With my table ratio of 90:1 and a 200 step stepper, that's about .02 deg./step which should work well. I have yet to fire Mach3 back up and look at the angular function but I assume there is a function to relate rotation to other axis travel so eventually I can corner the market on Quorn motor posts.
So happiness on that level but being severly spatially challenged in the shop really turns me off to the use of a desktop, even though I have Ethernet and a wireless access point in the shop. Ergonomically, the use of an iPad would really seem ideal (wireless connect to an interfacing controller?)......
Again, thanks to all who responded.