Windows 7 Logitech Cordless Elite Duo

Hi all, I have looked all over the net and in windows and have not been able to find a way to remap the side mouse button (to do double click instead of back) on the cordless mouseman optical (does not use setpoint). Also, some of the multi-function keys on the keyboard of this combo do not work (used itouch). Logitech does not support these products any longer and I don't want to give them up as I think the new mice don't fit right (and they still work fine - except for these programming issues). Any way to change the mouse button remap in the registry or something in Windows 7?