EDIT: Fixed it myself! Found XPadder which turns the switch into a keyboard press. You can then set XPadder to trigger a button on release. So when I bind battery power to the "B" key, one throw sends a B, and the release throws another B, perfect!
Oh man! Been using Xpadder for a couple of years and I had no idea that it could do that! That will make things much easier for me down the road when I start building panels. Thanks!