I'd like to see the color of text in the buffer set by whether it's Radio 1, 2, 3 or 4, not by what channel you're set to. For example, right now if you tune Radio 1 to country, and Radio 2, 3 and 4 to say, 120, 106 and 140, you have one channel coming in as green and three as yellow. If you're not paying attention to the channel number in a message name (like, Saxman 120: <message>) that can be pretty hard to read.
Instead, set a default like:
Radio 1 - Green
Radio 2 - Red
Radio 3 - Yellow
Radio 4 - Purple
And allow players to change them.
The non-channel text like System messages, PM's, CM's in scenarios/etc, could be kept the way they are, since they're in different colors anyway and easily recognizable.