While there is already a large number of categories and adding more regular ones would crowd the leaderboards too much, I think an addition of IL's for 3lap, and especially Flap would be beneficial because I cannot really find anywhere that has Flap documented correctly. An IL addition could be good but there could be a separate Mario Kart 8 Deluxe Leaderboards, like category extensions, just for 3lap and Flap. If enough people say they like a category extension idea, I'll try and get it up and running with 3lap and Flap.
Not the first time this was brought up. This site is for RTA speedruns only. http://www.mariokartplayers.com/mk8/ Go here for time trials.
People ask for the most ridiculous categories that no one in history is going to run, there is no need for a CE.
I don't think they have Flap though, I think an addition of Flap would be good, although it might be better on that page
Flap means one lap, like how fast you can go around one rotation of the track. Sorry for not specifying