Backwards somersaults:
Whilst you are setting the angle of jump (ie. whilst pressing B), tap down-up, then jump off at 60 degrees.

Increase distance:
Hack the run buttons whilst in flight to increase distance.

Mogule Jump:
Same as 'backwards somersaults', except tap left-right.

Super V Gliding:
Tap right-left BEFORE you set the angle of jump.