To me (and a few others) it happens quite often lately that I talk in the wrong chat during hectic situations (or when I'm not completely awake anymore). Which is getting quite annoying. -.-

I'd suggest changing the textcolor in the entryfield to the color of the current chat. Blue for channelchat, green for sector and so on...
That could help to avoid that problem since it gives a better visual clue as to where the player is talking.

Uhm .. disadvantage could be that the text might get a little less readable.

I love the idea because it happens to me a lot. Color changing wouldn't solve the problem entirely... its just a problem thats impossible to avoid in a command line interfacing... however I do think its the best idea out there.
Nice job.