I'm no trials rider, by any stretch, but I often use the slam your butt down on the back of the seat to get a sudden short moment of increased traction, which with an electric bike, allows for an insane burst of acceleration, where you can actually use that instantaneous torque to full effect. You can see him using it in the video to get the momentum up before standing up on the pegs for the wall climb. I love using that technique when riding with other gas bikes, because no matter how close they are on your ass, you will immediately disappear in the straights using that. It really pisses my friends off, because it tends to come with a shower of rocks when I do it