Doesn't sound to me like the right thing to do.

Where exactly does it rub? If your front derailleur is set up right you should have two shift positions for each chainring. That should take care of any rubbing on the sides of the deailleur cage. Check out the Park Tool website and follow their instructions beginning at the very beginning if you don't know how to get your derailleur adjusted that precisely.

My Energy crank with 109 octalink BB rubs on the big chainring when I'm in the little chainring and the two smallest cogs. I just use that feature as an audible indicator that it's time to change chainrings.