No one seems to buy the argument that right-clicking is confusing for new users. Well, I've seen it first hand, and it definately is a problem.
I teach an Intro to Computing course at a local university. The scope of the class is basically becoming proficient in the MS Office suite, some intro to databases, and html basics. I teach both Windows and Mac labs.
Course statistics are showing that the mac users have better grades. Come to your own conclusions on that one. But the interesting thing came just a couple of weeks ago when the database section came up.
We were supposed to have a section on Filemaker for the mac labs and Access for the windows labs. Well the wonderful IT group removed Filemaker without telling anyone so we put the Mac folk in the windows lab for a couple of classes so they could do the Access project.
I had to field the better part of a dozen questions about what was going on when people were clicking and weren't getting the results they expected. They were right-clicking and weren't aware. Past those questions, I had to explain that right-clicking was the same as ctrl-clicking on their mac. But as I watched, they still would accidentally right click when they didn't mean to.
Sorry this got so long, but long story short, the multi-button mouse was a much larger issue that I ever imagined, and I wouldn't have believed it if I didn't see it with my own eyes.
That said, I don't expect you to hop on my ship here, but perhaps take it into consideration.