I cant check this ingame right now, but if i remember right, you have to bind mouse actions in the second column in the keybind settings. First column is for keyboard bindings, second for mouse bindings and third for gamepad... might mix this up with another game...
Another problem that I ran into, battlefront 2 seems to not register any mousebutton events with an ID higher than 5. I configured some buttons on my mouse with "mousebutton 4", "mousebutton 5" and "mousebutton 6". The first two are recognized in BF2 (although as button 3 and 4 if I remember right), the last one (button 6) is not recognized. Perhaps this is your problem. To solve this, bind the key to something else.
