settings usb mouse rate

[Hans Petter Selasky]

Hi,

The patch is in.

http://perforce.freebsd.org/chv.cgi?CH=166075

Please try rates from "moused -F 1 XXX" to "moused -F 1000 XXX". Check that 
the rate is actually set by enabling ums debugging:

sysctl hw.usb.ums.debug=15

--HPS