Man this has bugged me since the early days, it's just one of those things that I never remember to post.
Right now it's possible to sit on the take off and stand up mid air, but you can't do this the other way around. You can take off standing up, and sitting down works if you're really quick, but if you don't catch it in time you're doomed to spend the rest of your air time standing up like a dead sailor while the sit button is totally unresponsive.
Can you please adjust this in the next beta, make it possible to sit down / stand up and mix it up at any point during a jump? You could also make the transition between sitting and standing much smoother when the bike isn't on the ground, as it's useful to sometimes sit and tuck the bike up a bit in the air both in SX rhythm sections and while whipping.
Thanks 8)
+1
Will look into it!
Thanks Snappe :)