Firstly, I want to say hello, I'm new here. (actually, the first post, but I'm interested in MTA for a while)
Secondly, my English isn't perfect, I'm from Poland, so, sorry.
I think this will be very useful too have an ability to clear whole chatbox (and maybe console?) via scripting.
Possibilities with this are huge. Eg. chatbox tabs (outputs stored in a table. When user change tab, the chat is cleared and outputChatBox is called with every item in a table) or cleaning the chatbox when user change account.