I've been thinking about building a new guitar lately, but have some questions...

1) What is the effect of turning a pick-up upside down?
2) Is it possible to wire a system that works like this.

1 Neck Humbucker
1 Bridge Humbucker
And an upside down single coil in between the 2, but put
a switch on the single that can turn it off and still have the
other 2 functional, and keep the 3 way switch working for
the 2 humbuckers even if the single is disabled?

Or am I overcomplicating things and really just talking
about a volume control? Haha.