Ive got wheelie and im pretty sure ive landed on a character, but ill try again just to make sure. It seems like ive tried everything and i cant get any new boost feats to pop up.
I started doing the stunt challenges on the atv instead of the mtx and had no trouble winning every event. I just tried landing flat after every jump to get the touchdown boost (it seemed easier to do on the atv) and i tried hitting every boost gate i could. By doing those two things, i built up enough stunt points to win the races.
I cant believe more people havent played this game.