GW, please make the Guild Chat in a separated message window. Yes we have filter for messages, but we cannot only click Guild chat, usually we still need map chat, to know a mob is up again, and few others like whisper. And that will make Guild Chat message immersed in tons other messages, and you easily miss guild social chat, which is important for a guild.
I also play WoT, and its separated clan chat window is very good, you can easily see all on-line clan mates, and greet and chat with them, make you feel you are in a group, even you don’t play a battle with them.