I made a patch for freebsd -current's moused that lets you scroll up and down while holding the middle mouse button and moving the mouse up and down. I found this feature in windows on my laptop extremely useful, perhaps others will now aswell in FreeBSD.

The patch is available aswell as the patched source (which may or may not work for you).
Usage - Copy the source or patch to /usr/src/usr.sbin/moused. If you got the patch, then do patch < moused-patch. Run make all install and it should build it and install it for you.
Two new options are thus added to your moused: -V and -U. -V enables virtual scrolling and -U with a number parameters specifies the distance threshold (defaults to 5) before a scroll tick happens.