Janssen

So I was just wondering, you know how you Press And Hold Caps Lock to talk in game, right? I was wondering if anyone knew how to get it so you can Press Caps Lock Once to toggle chat on, and keep it on, then be able to Press Caps Lock Again to toggle chat off, for long transmissions. I know Teamspeak is a thing, but I was just wondering if you can do it for gang chats and stuff in-game. Thanks for any replies! -Janssen