It's just silly to say you can or can't "right click". Ok, so if you plug in a 2 button mouse, you can click the right button and it will bring up the context menu. But if we're talking touch pad, there is no such thing as a "right click". There is an action that occurs that is generally associated to a "right click" but that doesn't make it a "right click". Right?
My team delivers a lot of graphics-intensive desktop apps with complex user interaction (think 3D modeling, etc). We go out of our way to support Macs, Windows, and Linux. It's actually pretty easy to give Mac users as many mouse gestures as we need (as many as six to eight different kinds of click/drag operations); the hard part is helping new developers understand how to code in such a way that this remains possible. People who have never used a Mac just don't get it, I'm afraid. But you can do an awful lot with that one button!