callouts?
rubberstamp?

I don't think PDF belongs in SSC, it would add too much luggage... but being able to trigger capture from the commandline could be useful.

Apologies ahead of time for resurrecting an old topic.

If you are still considering adding a screencast feature to ScreenShotCaptor as an add-in I vote a huge YES!  Here is my supporting argument.

I found DonationCoder after a desperate search for what ProcessTamer does.  It was so great I started seeing what other softwares were available.  I saw ScreenShotCaptor and said to myself "Oh no, no another one".  Of course I was wrong, it is a great and unique addition to the tools I use every day and has replaced any other screen captor program I was using.  Although there are other products that do screen casting I am sure you will add a certain flavor to it eventually and it will be as unique and wonderful as ScreenCaptor is.  We surely would be worse off if you had asked the same question for ScreenShotCaptor and everyone said "nah, it's already been done for free."

Please reconsider adding this feature and thanks for for all your efforts.