(I don't use Ubuntu much, but...)
Try:
cat >> /etc/modprobe.d/usbhid.conf << "EOF"
options usbhid mousepoll=2
EOF
...this .conf file should set the option for you the first time the module is loaded, and be persistent.
Also, after the module is loaded, this will (probably) change the polling rate on the fly:
echo 2 > /sys/module/usbhid/parameters/mousepoll