Just been perusing through my old stomping ground of the Sound on Sound forum, and came a cross a chap who installed some push-button switches on his Strat. He never used the volume or tone knobs (he prefers an external volume pedal), but wanted to be able to get all the permutations. These particular push-buttons have got LED illumination to show when they're active.
Of course you an get all the permutations on a standard Strat with a single additional toggle switch linking either the neck (like my DG Strat) or bridge pickup to the output of the selector switch. And with no volume pot connection, the pickups are going to sound pretty bright (though you can simply wire in a 250k resistor from the output to ground if you want to get back to the normal sound).