That is precisely how it works, Esther. The "Edit In CAS" button did not appear for my vampire however, so I guess it doesn't work on mummies, simbots or vampires. It works on ghosts, but shows them as normal sims when you get to CAS.
@PlatnumDymnd:
Instead of using maxmotives, you could try using testingcheatsenabled true to shift-click the mailbox and choose "Make Needs Static".