Well I guess this is a partial answer to the tyre pressure argument:
When needed to adjust tyre pressure, instead you can have different strength rubber and what ever that bedy spoke thingy is. Rather then having to adjust tyre pressure you simply swap the wheels for what ever conditions, and it means that there are no flats. But where can you carry 4 extra wheels? My suggestion would be: Attach one to the roof, one in the boot, one super glued to the bonnet and the last you hold dangerously whilst making your way out of IKEA.