Oh man, so sorry this is still hanging out there.
I'm addressing the following issues in the next few days, testing, and releasing update:
1. Handling and documentation of how DEFAULT works.
2. Notifications (some folks are being INUNDATED by notifications of expiration.)
Just a note, which I should add to the docs: On any site where SEO is important (MOST) you should really think about what you want done with posts on expiration. Deleting them will lose any link juice you may have earned, and break any links people have made to the posts / pages. Changing categories or tags, however, should be relatively safe.
A common use case for Content Scheduler is the addition of holiday posts that sites want removed or something after the holiday is over. Some sites will add it to an "Archive" category or something, or remove it from the current "News" category so the post no longer shows on the main page, etc.
Okay, I'll stop talking and go work on some fixes. Thank for your patience.