Cottage Living townie question

If you want the same ones to always be Mayor, etc, try this: Take the sim in question into CAS via a cheat or cheat dialog and save them to your library before they get moved out or altered. When a new Mayor, etc is generated, take them into CAS. Put your recently added sim from the library into the same CAS as the newly generated sim. Change the name of your recently added sim to be the same as the generated sim. Delete the generated sim. Go back into the game. Now you will have the same sim you are used to seeing, just with a different name.

I do not know if taking them back into CAS and changing the name back to what their name used to be will work. If you try, let us know if it works to change the name, too. I have not tried that, yet.