I think that the chat system could use some work.
Your Suggestion: Enable us to chat no matter which windows we have open, instead of having to close windows to continue a conversation with someone.
How it can help: It will allow us to play the game, while still communicating with our Alliance's,Friends, and people we are trading with.
(I.E.- If I am trying to trade with someone in the auction we can communicate while doing so unless we close the auction) This goes for many other Windows that we open up.
How it may not help: I do not see any draw backs to this at all.