I'm new to this but so far I've discovered that it might be useful if before cutting you had an idea about how many passes the machine was going to make to achieve your desired depth and how deep the last pass was going to be. At least for me so far the depths I choose are mostly arbitrary based on visual appeal.
If, at least for me, a last pass is only going to be a few thousandths, I would probably elect to skip the final pass and speed up the carve by that much.
I know this can be figured manually before the carve, and the DOC changed to make the passes come out even, but I'm lazy and don't want to fool with it. Might be nice to have the computer figure this out. Just a thought