If GM won't make a volt that goes 20 miles on an electric charge it would be nice if they included a feature that allowed me to select how far I wanted to go on an electric charge anywhere under the maximum range which should in turn increase performance.
Scenario: Let's say I'm only going to travel about 10 miles on a Saturday. It would be neat if on the main touch screen there was an option to select a distance that I wanted the batteries to be responsible for. All the extra juice available could go to improving the performance, aka acceleration. Instead of taking a slow 10 seconds to go 0 - 60mph the car could do it in 6 seconds.
If GM is going to make me pay for more battery than I need it would be nice to have some say in how it is used.
Sounds like fun. Except for one thing: That control over the 'juice' is already in the car. It's called the accellerator pedal. (aka, throttle, gas, 'that pedal on the right', etc.)
To get 6 sec accelleration you would need to put a larger motor in the car - accelleration has very little to do with battery (it does at some point, but there appears to be spare capacity for a higher drain motor. Currently the 111kW (iirc) motor is estimated to get you 0-60 in about 8 sec. If they were to increase the size of the motor to, say, 150kW (meaning about 220 hp instead of 160-ish) you could get your performance, but it would reduce your AER at all times - bigger motor uses more juice, even when not being juiced...
What you're looking for sounds like it may be presented in a Cadillac Converj.