you can map the back and forward buttons on the thumb - but not the scroll rocker. I have the mouse and the logitech control center works great for mapping the buttons.
I've been having problems with mine just freaking out lately - it will start scrolling through menus, or pop up the window switch (like cmd+tab) and just scroll through it forever until I slam it on the desk.
Sometimes the mouse buttons will stick and the tracking has been horrible lately.
I've had mine about 3 months and it's worked great up until the last 2-3 weeks. Haven't installed any new apps or anything that would screw with it, so I'm not sure if I just have a defective unit or what.
I'd be curious to see if anyone else has had any problems and if they've found any fixes.
When it works - it's the best mouse I've ever owned, but I would love to fix the random quirks it's been having lately.