Yeah, but that's not really changing the campaign so much. I mean, a Level 11 Factotum with Darkstalker can basically guarenteed kill almost any dragon without any trouble at all (sneak up to relatively close, Cunning Surge for Spectral Hand + Shivering Touch in the surprise round, ignore SR, do 3d6+Int mod dex damage with no save). And then of course they can cast Animate Dead and have a really awesome skeleton or zombie. But that's just not the same as randomly Plane Shifting to a totally different place or such stuff.
JaronK