If it helps, I can't remember the last time I used my GC1710 in high gear. Maybe if I was going a long distance I would use it, but for the work and chores I do I am always in low and that is plenty.
If you want a backhoe with a MF SCUT, buy it now as a TLB from the start. The frames for non-backhoe models are different so it isn't something you want to try to add later.
Regarding the swiveling seat, I learned something not readily apparent until you actually work the tractor and dig trenches. The backhoes are strong and quickly dig out what you need. Then you need to move the tractor forward, which is necessary to dig the next section, and this involves: a) raising the bucket, b) raising the stabilizer arms, c) releasing the parking brake, d) shifting into gear, and e) pressing on the foot pedal. If you dig much of a trench you are CONSTANTLY needing to move the tractor forward. I have heard of others who don't use the brakes, etc, sit rear-facing, and just turn around and use a cane to push on the foot pedal to move. I am not comfortable doing that. What I found that works is I leave the seat facing forward, I kneel on it and operate the backhoe levers, and when done digging I turn around, quickly make the adjustment to move forward, then do it all over again. This is not something you would probably encounter or learn until after having much more experience than driving it around on a dealer lot. I don't think having two seats would make it much better but I admit I have not tried that.
Digging a long trench through their parking lot for experience would probably be frowned upon!!!