Some of the things I've seen listed are great, but I see not a whole lot of mechanicals, just a lot of convenience. The convenience comes from marketers who review sales of vehicles and come up with what they interpret to be wanted items.
Convenience for me: electric items to operate without key in run mode ie windows up/down, fully automatic window/sunroof closure when rain detected (didn't Rover have this at one point?), full operation from both front doors, dual sun roofs, sunroof fabric option, wash out interior, cruise on even after car is turned off (on once restarted), slightly larger door windows, 3 row seats, swing out/roll down rear side windows, and night trail lights underneath.
For the mechanicals: manual locker up front, more R&P choices, manual hubs on front axle, full float rear axle (w/manual hubs), front cv axles with flanges (for quick replacement if necessary), air bag suspenion, on-board air & tank to work suspension, tire pressures and air tools, larger tires, swing tire carrier w/ hi-lift/shovel, up/down rear window, better gas tank location, on-board welder (
), and self-diagnostic computer port/chip modifiable for DIY owner among them few more....
For lifts, there is not much you can do with the IFS/torsion bar. The biggest constraint is the operational angles on the cv's and the steering tie rods. You could drop the front axle housing, rehang it and then drop the same distance on the a-arm and this will keep the axles same, however, not the steering rack and pinion. You'll either have to lower that also or have to flip the tie rod end on the knuckle, or have a custom knuckle like other aftermarket manu's have for other IFS vehicles. Then there is the torsion bars, but reconfigured control arms can be designed to incorporate a spring strut eliminating the torsion bar altogether. Thus you will have better breakover angle. Then concern would be on the brake and sensor lines.