Also just so you know, the left button/right button swap comment didnt come from me, I copied that text from the Qt 4.6 documentation for the Qt namespace
Well, they are human too, the trolls
I just don't see the point of having a left handed mouse (that means it was ergonomically designed to be held left handed) and not swap the buttons - what sense would that make?
It would be equivalent to a normal mouse with swapped buttons.
The trolls probably put it there to cover this possibility.

Anyway, as I said, this can be set from the OS mouse settings, so eventually, this doesn't really matter, since you can change the buttons functions as you see fit.
It is not important on which side the button is, it is important what FUNCTIONALITY the pressed button has (as in the OS mouse settings).
In that regard the "left mouse button" is not necessarily on the left, but rather the button configured with the functionality of the "left button"(i.e selecting etc, and not for the context menu).