Fyi - driver seat can swivel w most 4x4 shifters. Also depends on your layout. A 50 layout would have the driver seat swivel 90 deg. Which still opens up the seat for better utility.
Re: improving support for seats - while quite subjective, I have found the OEM seats to be very comfortable and the “after market” premium seats to be too hard for long distance. You can get new foam (and seat covers) for OEM seats and/or add some foam wedges for more support if desired. Seat heaters can be added as well.
Beastie 3: 2002 7.3 EB Cargo: Agile TTB, CCV Mid Top, Custom Walk Through, Lots of stuff added. BlingMyRig.com