If you are talking phase switching, all of the above apply.
If you are talking a shift, that would mean 1t4 or 1/2 out of phase. I believe, from what I read on the old Duncan wiring diagram of the Jerry Donahue Tele wiring. There one position placed one of the Tele pickups partially out of phase. I think the result was to get more of a strat bridge/middle tone from a Tele middle position.
The diagram used to be on the old tips page, pre site update.