Never really watched schenker before. I'm not a big fan of "shredding"
One thing I did notice, is that he stands with the bottom half of the V sandwiched between his legs.
Mustaine does this also when playing particular Megadeath solos. It looks kind of odd, but I imagine it helps you relax the fretting hand by making the guitar stable enough that you don't need to be supporting it with your fretting hand. you can just fret. Well, thats my theory.