I think the biggest tractor issue out there is when there's a loose nut behind the steering wheel
Most of the changes are pretty evolutionary. More power, stronger, faster hydraulic pumps, better fuel efficiency.
I can agree with the mounting-dismounting issue, retractable levers may be a good fix. Of course, there are a lot of people here who complain about hydrostatic transmissions being the work of the devil and physical gears are the only way to go so good luck with "fly-by-wire" control acceptance.
I'd like to see more offroader features built in, individually locking differentials in the front, rear and center as well as more advanced 4WD systems. Perhaps even a hydraulically operated lift to provide clearance when needed and a low center of gravity when clearance isn't an issue. Or maybe I just need to look at a Gator or an ATV...
While we're at it, if you could come up with a way to have a tire that can both provide a wide, smooth surface to float over lawns without doing damage but also be able to be narrow, traction grabbing monsters that can pull you out of the mud that would be fantastic. I could see this feasible with turf tires that could deform into R1s by raising some hydraulically activated bars inside the rim, but we'd need a whole new type of rubber and mounting the tire may not be possible without special equipment.
Connecting implements is always a pain, something like John Deere's
iMatch AutoHitch is a good attempt, but the more generic the feature is and the more implements it can be applied to the better.
Probably the biggest thing CUTs have to deal with is weight distribution. CUTs are flexible and often see a lot more varied uses than field tractors, this means sometimes they're heavier in the rear and sometimes in the front, sometimes they've got a big mower hanging off the side and sometimes they're on a slope. Add to that a large percentage of clueless homeowners like me driving them and proper ballast is an issue. Sensors on the wheels to determine the center of mass of the tractor would be a great indicator that you're exceeding the abilities of the tractor configuration, being able to have a mobile weight in the frame that can compensate for this would be even better. Of course this weight shouldn't affect the clearance, should be quick to respond, and probably needs a supercollider to create something dense enough to make a difference, but if you could pull it off it would probably make a career.
One last interesting tweak would be the ability to mount an emitter on the top of your garage door that would automatically lower the ROPS as you enter. Of course if that would impact the safety it'll never get implemented, but worst case detect that the ROPS is up and that you're approaching the garage so you can sound a buzzer. And by "sound a buzzer" I probably mean apply a strong voltage to the seat since you probably won't hear a buzzer or see a light
