Nobody?
I want one!
It'll disappear as soon as it hits local customs sadly, unless I use DHL which costs a fortune.
I'm thinking that if one feeds the regen to some supercaps and then a MPPT you should get more regen than otherwise:
Supercaps can take amps and MPPTs change low rpm/voltage into pulses of battery charging specific high voltage pulses.
Just an MPPT would also work.
Then you want rotor field winding control to zero cogging when coasting etc
and to increase the rpms at which the motor can run etc.