So i have the standard wiring and pups...

what happen if I would reverse the mid pup? Ground wire to switch and Hot wire to ground?

and also, would that make position 2 and 4 humbucker (i mean, still no hum?) and series mode?
No, it'll just make 2 and 4 out of phase, which will make it sound tinny and trebly.

Humbucker coils are wired in series. Strat pickups are in parallel. The middle should already be RW/RP (reverse-wound/reverse polarity) anyway to make the 2 and 4 positions hum-cancelling.
out of phase sounds are cool, but they're not for everyone.
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Oh, i thought that would make it series...

wouldn't that connect the bridge's hot to the mid's ground? just asking..