I think bunny hops are an essential skill; They have saved me a few times when a swerve would have been too dangerous. One time I jumped a deep pothole at about 80 kph. I was on a fast sweeping descent which appeared safe but the hole was hidden by the way the road surface curved away from me. (Yes, I could have braked downhill for 3 km to keep my speed down, but where's the fun in that! !)Wheelies (on the Brompton of course) that would be good, if less useful. Ditto bunny hops.