My real experience is as an end user of a programme written specifically as a library database. There are I think 4 levels on it from guest through to master. I worked below master at administrator level but knowing that programme well, still doesn't qualify me to know anything about the shell of filemaker that it sit in or even how it's built.
My only other moderator experience was with proboards when Sandy Chapple was running Happy Hen House, but once again, I don't know enough about proboards or the background techy stuff to know if that is a better substitute for ubb threads.
Sorry I can't help here.