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Hmm, I am thinking that by locking mg1 (the sun gear) to the case at speed, that the engine basically drives the wheels directly, and let mg2 freewheel (if that makes sense on a PM motor). Eliminating the losses for that portion of the torque that is getting converted to electrical and back to mechanical, as well as holding current for mg1. It is a controller nightmare in reality, but conceptually it is simple enough. If the inverter doesn't care at speed when the car is off, then you could lock mg1 and switch over to a megasquirt+ for the ICE.
Yah, a pedal controller sounds like a good low hanging hack too (via some sensor taps and cruise control actuator?), will have to look into that in a different thread.
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