Wow. That's a pretty comprehensive list.

15. Animal rescues
15-a - cat in a tree
15-b - pet caught in a fire (see 12)
15-c - lost pet
15-c - Animal attacking people (e.g., a tiger on a certain island)

16. Santa Claus/reindeer fill-in

17. Counterfeiters
Superman rescues the economy from a flood of fake money. (Yeah, OK. I'm stretching. As I said, your list was pretty comprehensive.)

18. Kidnappers
Clarification: For some bizarre reason, these kidnappers actually don't go after Lois. (See 9-d)

19. Hackers
19-a - Hackers intent on embezzling/stealing funds. (Note: The hackers are not intent on world domination. See 11-b)
19-b - Hackers intent on spreading propaganda against a government or a political organization.
19-c - Hacker who thinks telecommunications (especially television and the Internet) are ruining society and determines to save civilization by bringing all telecommunications to a halt.

That's what I can come up with for now.

psst, Virginia, I just realized that neither Myxy nor magic are on your list. Did that imp delete the relevant entry?

Joy,
Lynn