So, I'm just playing on the server, and I want to send a message to global. Oh look, I've sent one 4 seconds ago! Didn't know that though... so my message was sent to local. RIP.
Here's an idea I thought of: A visible global-chat-cooldown-timer! Something visible that players can see easily so they know when they can talk in global again.
I think it'd be pretty cool if it was put into a scoreboard on the right side of the screen, but that's just an idea.
It'd be cool to know if this was possible :)