My ever-inventive users (whom I enabled chat for) today found that they could use @here or @all even if it was prohibited elsewhere. (They always find the darnedest things…)
If there could be a switch to disable that, that would be ideal, as would a switch for disabling Chat DMs / PMs (I had to manually add CSS rules to hide the buttons, which obviously won’t hold forever.)
Edit: Thank you for placing on correct topic, I somehow didn’t see this one, sorry.
In the meantime I’m going to try to use Watched Words to block and censor the use of them. Which is another imperfect temporary solution because those can be bypassed (like the CSS hiding PMs) but as long as they don’t figure it out until a switch is added…