The category would consist of getting as far as possible/getting the fastest time while touching the floor/roof the minimum amount of times.

you can go through ANY gap that isn't a 1x1 hole with 2 blocks, you can go though 1x1 with a saw and a block though it is very hard, so it'd make the game much more skill-based and would likely take a while to get perfect runs

P.S: touching it in a moment where it isn't required in endless would invalidate the run, but touching it in one of the worlds would mean you'd have to restart the level until you got it.