ok now... I tried it by myself!
I found
http://www.xfree86.org/current/mouse.html
was a good source for configuring.
My HP PS/2 scroll mouse now scrolls
and does anything as wanted.
I just corrected the mouse section as followed:
Section "InputDevice"
Identifier "Configured Mouse"
Driver "mouse"
Option "CorePointer"
Option "Device" "/dev/psaux"
Option "Protocol" "Auto"
Option "ZAxisMapping" "4 5"
EndSection
Section "InputDevice"
Identifier "Generic Mouse"
Driver "mouse"
Option "SendCoreEvents" "true"
Option "Device" "/dev/input/mice"
Option "Protocol" "Auto"
Option "ZAxisMapping" "4 5"
EndSection
This should work with your USB Mouse too now!
But be shure to activate the kernel drivers for USB-HID and
USB-mouse support.
And dont't forget Input core support and Mouse support (mousedev under kernel/drivers/input) because otherwise
/dev/input/mice won't be available.
For debian you can do this under modconf.
Have more fun now with your scroll mouse