three button mouse issues

[Stephen Montgomery-Smith]

My laptop has two mice - the touchpad and a usb mouse.

I would like the touchpad moused to run with the "-3" flag and the usb 
moused to run without "-3".  But I can only get neither or both to run 
with "-3" by the appropriate settings in /etc/rc.conf.

Any ideas?  (Apart from manually killing and restarting one of the 
moused processes?)

Stephen