The idea is very simple: finish a certain amount of tracks without pressing R or ZR, which means: no drifting, no jump boosts and no hops. You can actually still drift by simply turning the L sitck sharply, but it's much difficult. To avoid accidental ZR or R presses, disable the buttons on the Switch configurations menu. It's very stupid I know. (reposted here becuse people told me)

Edit: Just did a run of the Mushroom Cup, 150cc, Items and got an 10:47

Hey, why we don't use IGT instead of RTA? It would be closer to how it works on Genesis and the 2013 ports.