Is there any way to clear all messages for all users with 1 command, like /clearchat.?
you can broadcast the /clearchat command by modifying lib/class/CustomAJAXChat.php to include.
Then catch the "/clearchat" command by overriding the customOnNewMessage function in js/custom.js - any command executed here to clear the chat will be executed by all users (you may want to add in a check for which channel they are in - but that's up to you)
Sorry I can't write the code for you, but I hope this helps.
what if we're not scripters? Can anyone make something like /clearchat?