The reason I want an off position is because I have 3 pickups. I want the seven options you can get with 3 pickups in both parallel and series. The way I've figured to do this is have the 5-way switch with the positions mentioned above and then have a separate on/off switch for the middle pickup and a switch to put it in series or in parallel.
If anyone has a better idea for this, it would be greatly appreciated.
Thanks guys, for spending your time answering my question.