Another bonus would be to control the charging of the battery too. In a 1/4mile pull, I drain the battery and since I can't plug it in, I have no choice but to drive it around to get battery back. I'd like to be able to sit in a spot, run the engine in neutral to recharge the battery for the next run.
This isn't related to hondata but i couldn't refuse to post this here.
You don't have to modify anything, the CR-Z already does exactly what you want by default ;-)
Just park the car, put it in neutral and rev above 3000 rpm and the battery will start charging as long as you leave your foot on the gas.
Make sure you at least open the hood to prevent overheating as a full charge from 3 to 8 bars takes a couple of minutes.