It is simple really.
1 - Goto various videos and mark sections with A-B
2- Create playlist - Have an option to limit just to A-B sections. Start each clip at A then play to B.
3- Have them play without loading screens between each clip through smart buffering
At the moment, you have to mark each segment with start and stop times with is over complex and there are delays between each clip switch.
Yes, this means only one segment per clip but it is simple and fast.
Simples