Re: Pickup Position Explanation
Well, neck pickups and bridge pickups are good for... whatever your ear likes them for. There's no rule about what to use each position for, though the sounds you listed are, I suppose, fairly typical.
As for wiring, I really like a neck humbucker wired in parallel for a clean tone. I personally find this far preferable to coil-tapping. I don't find that a bridge humbucker in parallel is quite as useful, though I have been known to experiment with taking a coil from each pickup. In parallel, this seems to result in a tone that's a bit brighter than a neck humbucker in parallel, though still with enough output reduction to result in a nice clean sound.
I also have one HH guitar with a P-Model Megaswitch from Stew-Mac. This gives you:
1 - Bridge humbucker
2 - Inner coils in parallel
3 - Outer coils in series
4 - Outer coils in parallel
5 - Neck humbucker
Position 3 here is interesting. To my ear, the sound is much more defined that the typical "both humbuckers on" setting, with a pretty unique tone, at least with the two pickup sets that I've tried it with. Positions 2 and 4, as you might expect, sound pretty similar. I wish they could have made 4 the neck in parallel, but they were trying to mimick the options on a PRS rotary switch, apparently.