[curt.clifton]

I found some time to bang this script together. You can download it from my software page. Here's the marketing blurb:

This script marks the selected action as complete and creates a new action, like the selected one but prefixed with "Reply on:" and placed in your Waiting For context. Great for email and other actions where you expect a reply.

You can change the prefix to your liking by opening the script in Script Editor. You can also tweak the name of your waiting for context if the script doesn't guess correctly. (It looks for the first context with the letters w-a-i-t in it.)

This has had very limited testing—much less than I usually like—but there seemed to be demand, and I didn't want folks to wait too long. I don't think the script could do much damage even if it has a weird bug.

Share and enjoy!