Does one exist on the XF300? When I shoot manually like sports with EX1 I enjoy using the small lever on the zoom ring, but on photos ont he XF300 I cannot see one, so what would people suggest to control the manual zoom ring?

I saw this on a friends camera . He took a plastic electrical tie & placed it around the zoom ring & cut it to a length he liked & filed down the rougth edges, it worked very well.