While we do have great seats, we don't have any seat rake adjustment [just up and down, forward and back] and I wanted just an bit more of rake [incline] in my drivers seat [to raise my my legs up a bit and not feel so 'flat'] so I went to Home Depot bought two bags of washers and removed the two front bolts holding down the drivers side seat and added a few washers under the seat - raised it about 3/4 inch. Put the bolts back- took it for a drive....muuuuuuuuuch better. Best of all - it's a reversable mod.
Good idea...wish you could do the opposite -- reduce the height of the rear seat mounts. They rest on floor "bulges" but there's no way of cutting them down short of using a torch...LoL Would give a lot more head room -- in the Koup SX anyway!!!