Nope, you can award them anytime. I've mastered the "Flying W", but with a twist. I reach back with my right hand and catch the seat before it hits me in the head. When I first got a front disc brake, and those grippy Continental XC tires, I had plenty of practice.

On a side note, within 2 weeks I'll have a spare MTB, so looks like you'll have no excuse for not going out with us sometime.