here some suggestions
-only use shades of blue and red please, no purple/green, and ideally keep the colour constant for the same player
-place the chatbox higher so that it doesn't overlap with other ui stuff
-when you play in full screen some artifacts appears in the text characters (maybe make the font bigger?)

-display name changes and joining/leaving server like on lorgan's chat
-like the other chat, could it be possible to scroll to look at the chat log, and preserve a part of the log between maps so you can read what people were spamming at the end of the match?
-if you use shift during your chat input, the scoreboard will popup for one frame when you send your message (really minor issue, probably doesn't happen if you map the scoreboard to another key)
from the end user point of view, the only improvement over chat_v2 that i can notice for the moment is the ability to copy paste while a lot of other features are missing
and using a spam macro, it appears that there's no cooldown or automute that prevent spam, or was it because i was the host?