Genius Ergo 525: The useless mouse

I ordered a mouse with my new notebook. I choose Genius Ergo 525, the main reason was that it seemed that it was equipped with 12 buttons. I say it seemed, because it was not! The mouse has 8 buttons (only 7 of them generate events recognizable by computer, and only 5 of them are recognised by X) and 4 bloody "keys", i.e. the buttons that behave as keys on keyboard in my Gentoo (and also in Kubuntu).

More precisely, if I press e.g. the button marked "+", the events

KeyPress event, serial 32, synthetic NO, window 0x1a00001,
root 0x63, subw 0x0, time 1093549082, (89,131), root:(1110,155),
state 0x0, keycode 176 (keysym 0x0, NoSymbol), same_screen YES,
XLookupString gives 0 bytes:
XmbLookupString gives 0 bytes:
XFilterEvent returns: False

KeyRelease event, serial 32, synthetic NO, window 0x1a00001,
root 0x63, subw 0x0, time 1093549258, (89,131), root:(1110,155),
state 0x0, keycode 176 (keysym 0x0, NoSymbol), same_screen YES,
XLookupString gives 0 bytes:
XFilterEvent returns: False

are generated.

Obviously, some engineer was very smart again, because he "knew" that if someone needs a mouse, than he surely needs two buttons for volume control and two buttons to control audio player. Yes, of course I can change actions assigned to these keys, but this also changes actions assigned to appropriate keys on real keyboard. So I can make my choice. Either I will be able to change the volume by mouse and keyboard, or by none of the two. Next time, I'll buy myself a Logitech mouse :-)