Camtasia and probably most other screen capture software (WME included I'm sure) let you choose the framerate, so if you capture at 1 frame a second and then make your video 24 frames a second that should be fine. That would be x24 speed, so with that in mind you can scale it however you want.
This is just a theory though, I haven't tried.
Edit: Now that I think about it that technique might only apply to capturing a series of images. So in that case just take a bunch of screen shots and use something like VirtualDub to string the images together in a video.