There's a few of us tinkering with our Volts. The controller we have access to controls the gas engine, and is also the gateway for driver inputs. So we can remap the accelerator pedal for faster response, change engine speeds, and remove any torque limiting we find.
However, the electrical side is controlled by HPTCM1, and we don't yet have access to that. That is where the current limits and ramp rates are set for the motors.
There are a few scan tools which will let you see the motor rpm's, battery SOC, battery temps, and a LOT of other data. Changing those parameters is still off limits, for the most part.