Then this is an argument for NOT overloading the right-click behavior, not for adding a "No thanks" preference. Then all users who want to right-click have to go through ONE EXTRA STEP just to be able to do that?
I think the idea is that you would only have to do that extra step once, have that preference saved, and after that all right click / middle clickers would have the functionality they wanted. Doesn't seem too inconvenient to me, honestly.
