On shifting speed, if time spent shifting is of concern:
1. Simply loading the alternator can help slow the engine between gears during upshift.
2. for faster results, It could be a well calculated pre-ignition too.
How much power/energy to slow a 4cyl for upshifts within one engine revolution? Does it justify regen starting and stopping?
Though clutch is nice since it transfers much of the energy from the higher rpm engine rotating mass, that would be the comparison, lower rotating mass=better, or use hydraulic motor/generator for the starter (and stopper) if you are stuck with a flywheel, maybe
