I'd vote for this feature too. In my typical workflow, after captioning I change the color class of captioned images to remember which I had done, then I turn off that color class and continue along. I once turned on a color class just for a look-see, didn't turn it off again, and promptly re-captioned almost a whole shoot (the ones that remained selected at the time). I learned my lesson well that day. It's not the highest priority for me, but it would be nice to have some way to periodically capture a state to the hard disk so that after a boob, you can retrieve your state - kind of a Time Machine for PM...
Cheers!
- Ed.