Basically Dawn I changed the settings the other night because it was being abused. After a long thread with a lot of input from a lot of people suddenly disappeared for no valid reason, I disabled the option for users to delete threads. It's annoying when people have spent time replying to threads for these just to be wiped off all face of the forum.
Unfortunately I can't disable features for individual users, just groups.
If you want a post deleting, please let me know.