Twisting the shaft? I guess that depends on the bike, and how you're getting it up. There's a pic of a twisted K shaft running around one of these forums.
My K1200S will loft the front about 2-4" just pinning the throttle through the first two gears. If I lean back a bit, or have a pillion, it gets a lot easier to get the front up.
But I suck at wheelies, so don't do them on my street bikes. I've thrown far too many dirt bikes down the road. The last one was my CR500. I blew a 3rd gear wheelie and picked myself up as my then-4yo son pulled up next to me on his CRF50. We then watched my CR500 cartwheel down the road for a while. I looked at him and said "That's not the way to do this!" LOL Expensive day.
Don't forget, BMW designed the geometry on the Ks (and Rs, but the R1200R is total cake to wheelie with just the throttle) to fight wheelies, which is why they're so good in the twisties coming out of corners. ;-)
My buddy can ride a standing wheelie all day on his Kawi 600, and he's not happy with the K-R's tendancy to fight wheelies (when he's trying to do them). It's the only thing he doesn't like about the bike tho. :-)
08 K1200S (Phreeooow)
06 Husqvarna TE610