To my knowledge, the probe and ets input(s) are not active in lathe mode, though to be honest, I’ve never tried it. This would be a handy feature since most of the reason I rarely use my rapidturn is that it takes so damn long to get it set up, mostly due to figuring out tool offsets.
My approach will be to use a manual tool setter for this but I haven’t had an excuse to set up my rapidturn since I got the thing. The intent is to set it on the table, the face of the rapid turn, and a yet-to-be determined reference face for the Y axis. Once I get one tool located, against those features, I can check any additional tools against the same features and note the difference in the DRO to use as my offsets for those tools. Still a manual process and it would likely have to be done every time I remove the tool post mount to account for any slight changes in rotational position when it is reinstalled, but better than touching off each tool on the part itself imo.