Legend is already working on that, and I'm not sure who added it because I couldn't find anything about it here on the forums, but ARFD does seem to have it's own radio. "/c r <message>" works just like the police radio, and appends a ARFD tag to the beginning of the transmission. Whoever made this, thank you!
As for the Medic and Firefighter skins not being used, I'm planning on getting that fixed. I hired Legend to run ARFD on that server in hopes it could be spread there to create more RP with those skins, and I've been visiting the server much more lately to improve some morale concerning the skins, and the careers themselves.