You can make bots backflip if you position the waypoints correctly. It's very tricky to do this but looks awesome if you have the patience to keep retesting over and over again.
Look at inf_Argy's waypoints. Play a dummy game with only a bunch of Alpha bots. Play as Alpha and follow the bots that take the highest path in the map. They backflip to reach the boulder above the flag, if I remember correctly.