on my MX1000, it has buttons directly above and below the scrollwheel.
I looked at a photo. It still seems far too small, like the size of a lentil.
Are you sure you're looking at the right part? It's the part at the top of the picture, above the scroll wheel, not in the middle of the mouse. That's not a button. It's definitely smaller than a mouse button, but certainly big enough. I like it because my middle finger usually rests on the scroll wheel anyway, and all I have to do to press it is to sort of push forward with finger.
...However the scroll wheel does tilt to the left and right, mappable to non scrolling functions if you want.
You know, I keep forgetting I can change that on the MX1000 too. I really should do that, as I've found horizontal scrolling to be pretty much useless. Perhaps I just need to up the scroll speed, but I'm sure I can find better uses for those two directions. Probably better Google Reader control
Anyway, I apologize for helping to get this discussion onto the finer-grained issues of mouse control
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