We don't, normally.
It's a free tool they're distributing. Other companies were doing that as well, but this one worked on the particular version of the worm we found on an infected machine. We've done this in the past, but it's been several years.
When there's a specific problem that needs removing, it's usually easier to throw a specific tool out there. This one is easy to script, it's just one file to distribute and it's usable by any end user on any computer (rather than Drew-issued only), etc. Also, we don't have the same version of F-Prot on all Drew-issued computers yet.