Logitech MX500 side(thumb) buttons

Hi,

I am trying to set up Logitech MX500 mouse with 10 buttons(maybe 8) under XFree86 ( 4.2.1 ).
The kernel's mousedev driver (2.4.19) can handle 7 buttons ( left,middle,rigth, wheel up,down, two side buttons )

The wheel up,down, button1,button2,button3 is working correctly with Gnome2.

The XFree86's xev program seems to recognize correctly the wheel, and the side buttons two.
( See the settings at the end of the email... )

The xev reports the side buttons as button6, button7 .

How can I bind keyboard events to these buttons ?
( I'd like to bind virtual desktop switching in Metacity to these buttons. )

Tried xmodmap, changed /usr/X11R6//lib/X11/XKeysymDB to handle XeroxPointerButton6 buttons - no success to
assign keycode events to these buttons. 
Maybe the new line's number in XKeysymDB assigment is not correct.

I tried to dig www.google.com search results, wheel mouse forums, but it seems that everybody is happy with the
5 buttons.

Can anybody help me ?

Thanks in advance,

Csaba Paradi
[email protected]

ps.:
What about handling the 'Quick Switch Program Selector' and the 'Cruise Control' buttons,
gpm's mev reports wheel events for the Cruise Control buttons and nothing for the Quick Switch button.
( It seems that it is not handled by the kernel's driver/input/mousedev driver... )




XF86Config mouse section:
------------------------------------------------
    Option "Protocol"    "ExplorerPS/2"
    Option "Device"      "/dev/input/mice"
    Option "ZAxisMapping" "6 7"
------------------------------------------------

xmodmap settings: 
------------------------------------------------
xsetpointer Mouse2
xmodmap -e "pointer = 1 2 3 6 7 4 5"
xsetpointer Mouse1
------------------------------------------------



xev's output pressing side buttons:
------------------------------------------------
ButtonPress event, serial 25, synthetic NO, window 0x3400001,
    root 0x3a, subw 0x0, time 3301386875, (131,10), root:(718,542),
    state 0x0, button 7, same_screen YES

ButtonRelease event, serial 25, synthetic NO, window 0x3400001,
    root 0x3a, subw 0x0, time 3301387099, (131,10), root:(718,542),
    state 0x0, button 7, same_screen YES

ButtonPress event, serial 25, synthetic NO, window 0x3400001,
    root 0x3a, subw 0x0, time 3301387667, (131,10), root:(718,542),
    state 0x0, button 6, same_screen YES

ButtonRelease event, serial 25, synthetic NO, window 0x3400001,
    root 0x3a, subw 0x0, time 3301387843, (131,10), root:(718,542),
    state 0x0, button 6, same_screen YES
------------------------------------------------

New lines in /usr/X11R6//lib/X11/XKeysymDB
------------------------------------------------
XeroxPointerButton6     :10070006
XeroxPointerButton7     :10070007