For people who have problems with their feet and back, the pedal is a non-starter and the dual pedal not much better. Cruise control only helps on long straight sections - not too common in tractor operations.
I'm thinking that those folks with foot and back problems should look into the fingertip operated shuttle shift/syncro glide shift transmissions instead of HST. A lot of new buyers just say, "It has to be HST" without actually looking at what the option offers. Shuttle shift has grown up. It's a nice smooth transmission, easy to use, loader friendly, clutchless F/R, has built in cruise control via the throttle, extremely reliable, more ratios available, more efficient, and is the less expensive new tractor option. What's not to like?
I've had several now. There are several types of shuttle shifts; all slightly different and worth a look.
rScotty