Might be as well to check out one of those Mac Simmers forums, like the one at Simfreaks that someone recommended, and maybe TSR? I haven't heard of that problem on the PC version, anyway...
Do modern Macs still only have one mouse button? PC users use the left button to select things and the middle & right buttons to scroll around (the middle wheel adjusts camera position and the right button actively moves the cursor). How do you select a whole room (we use SHIFT) or delete things in Build mode (we use CTRL)?
I'm asking all these questions in case they help solve your problem. Of course, if you're just venting, feel free to ignore...