Alright! This one is simple!
Bring down the console and type
bind [key] "say_team [message]"
Make sure to include the quotes! If you want to do it for local chat, you can replace "say_team" with just "say"
T
This key is default to "t".
In rpgxEF it is called global
I'm just saying it's useful because I'm binding (tab) to Caps Lock so I can hit capslock whenever I change models
Won't that mean you have to press it twice to not type in caps?
I mess with things a lot and I have unbound my caps key from windows. I only use shift now.