To add another angle to this, what kind of pedals/shoes do you use? Various kinds have different amounts of lateral adjustment in the cleat ranging from Speedplay Frogs and Time road pedals (none) to Look road pedals (about 6mm.) Also, if you need just a little addition, like 1mm or less, TA pedal washers which were originally made to keep pedals from galling the face of crankarms can add a tiny amount. 2 or 3 TA washers per side would be a safe amount to stack up if you are not using either very cheap or very worn (lots of pedal removal and reinstallation) cranks. That's another thing--the 3/4" addition may turn your pedal into a long enough lever to rip the threads out of a crank made of cheap metal. Everybody does need different "Q" factors, but you are talking about adding an enormous amount so be cautious.