For almost everything it would be useless, haha.
However, I am trying to record video of older program(s). Most screen capture programs are not compatible. The one that I found which works for everything I've tried (fraps) does not show a mouse cursor when used on older programs (at least the ones I'm trying to video). So, my thought is that I could record with fraps and then record separately with a video of only the mouse movement. Then I could use the mouse as an overlay in Vegas to get both in one video.
If I have no luck with this I will have to try coming up with another work-around for the lack of cursor.
Thanks for your help, it is greatly appreciated