"Where did you get the idea that anybody would set other than V2??"
It has been mentioned on other aviation forums, both for the 744 and 767. I believe some American airlines use it, but I haven't been able to confirm which ones.
I can see how having the command airspeed bug set at V2+10 would provide an airspeed target after liftoff (probably a more reliable target than the FD), but this would require you to make a mental calculation of V2 if you had an engine out.
" Liability being what it is, why go outside the manufacturer's recommendations?"
I agree, but airlines still do modify procedures.
Cheers.
NSEU