4-1, 6-1, 7-1, and 8-2 only require the player to survive for a set amount of time, and there are no ways to end the levels early, so they shouldn't have categories.

On the other hand, I believe 9-1's leaderboard should be reinstated, as seeing who can perform the astronomically difficult 'Cutscene Skip,' commonly thought to be TAS-only, twice in a row would make for an exciting category.

And how is the skip humanly possible?

Frame perfect pause button press the moment the cutscene begins.