Nysic
Power Star
having a track editor seems just incredibly unrealistic, they'd have to make it easy for everyone to understand and use which would be very difficult for something as complicated as mario kart tracks
if they added one you'd probably only be able to make very basic and flat courses similar to the snes tracks, which would be boring as hell
if they added one you'd probably only be able to make very basic and flat courses similar to the snes tracks, which would be boring as hell