Thanks for giving it a go. It's always recording - when you quit either through esc or alt-f4 it will save it. I'll add that to the controls in the description.
The 20 laps is a suggestion - you can train the planes to do whatever you want (within reason). e.g. in the simplest case you can show them that they should always hold the thruster down and not do anything else. Unfortunately I broke the training with my last upload and am trying to get a new build out that will work.