Thanks for the tip Simon, I didn't know you could do the mod with the bridge pickup. I've used a set of Bootstrap T-style pickups which conveniently come with the additional wire on the neck cover. So hopefully it won't be too much of a stretch to solder up once I get a push/pull pot installed. I've recently saw you can do the same mod with a Free-Way 6 position switch which has the usual three positions but you can waggle it up and down to give you an extra three positions. It looks neat but those switches aren't cheap!