Movie Salsa has post-processing capability that will allow you to call a command file (batch file) to do just what you want to do.
I have a batch file that changes the filename to one that is something like "cam01-yyyymmddhhmm.wmv". Unfortunately, my weather computer is down and I can't get to the files at the moment. I can post them once I get the system back up but it may be a few days before that happens. My ACER netbook has died on me and I'm looking for a new laptop to replace it.