What's actually missing from the Mac Screencasting options

...is the ability to edit the recording.  Specifically adding callouts; arrows, highlights, text overlay...  that sort of stuff.  I now have copies of both iShowU and SnapzProX, and they both do a really nice job of recording the screen.  Lots of variables like size of capture, frame rate, sound or not, but neither offers the ability to edit the recording, other than to pop it in to Quicktime Pro or iMovie to add titles, transitions, or trim and cut.  Is anyone aware of a Mac product that allows a .mov file to be annotated with highlights, text boxes, arrows, etc?  Can't wait for Techsmith to step in here...