Is it possible, that users with trust level 4 will be assigned automatically in staff team?
That would be a disaster for us; staff are people who can do administrative things; modding users, adminning accounts and posts. TL4 are just regular users who’ve earned trust for some reason and recognition by staff. I wouldn’t support a merge with staff.
What are you looking for in asking this question? What are you trying to do?
You can give tl4 users access to staff only categories. You can give them badges and a title to give them some official status.
One thing I’d like to be able to do is have tl4 users appear on the /about page. That and not show admins.
You can do this with a plugin. I’ve been meaning to publish one that allows you to remove admins from the about page with a user setting (so that I don’t show up on the about page on sites that I manage but don’t participate in moderating) . I think it shouldn’t be too hard to add tl4 similarly.
I’ve been too busy with paying work to get around to it, though.