Sorry for the slow reply.
Yes, all the steering and throttle control parameters have been moved / replaced in Rover-3.2 and the names changed as part of that to start with ATC_.
I'm going to ask Michael Oborne to re-do the extended tuning screen in mission planner to make it easier to understand and change the parameter.
I will also update the wiki's tuning guide before we do the official release. We're actually quite close to the official release I think. Just two more items.