thanks for the warm words;
considering the 120´ies origin this gazebo-synthesizer ( sounds like a spongebob-quote) is modulated for torque, an amplitude alteration as
http://patft.uspto.gov/netacgi/nph-Parser?Sect2=PTO1&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&d=PALL&RefSrch=yes&Query=PN%2F6727668 is far loer effective than delta7wye but seemigly something to consider on a vehicle that wants to coast sometimes and has no gears.
A more "yasseeboo" ( smoother sinuscurves) type of setting.
as for the optoelectric sensors, did you knew there are "reeded" ones available in microseize that can easily fitsomehere inside the case or running rotor of the perm ( 3i or others may have the right adhesive for that or you go the rfid-way here and simply drill some holes and use some industrial adhesive liquid glue). "multiple-casereeded electric powerplant" sounds cool, eh ?
the fact that these sensors could power an abs within the regen and signal output could drive another release-valve on hydraulic external hub brakes comes as an additional benefit.
if using a 4 or 7-wire technique now for the actual acceleration but regen purpose only your regen setting could alter it´s amplitude according the load on the rear wheel when decelarating, too, so the switchover from regen braking power over gravel braking power into the abs range i regen only would be a smooth one.