as far as the chat-invincibility goes, i think what was meant was when the person doesnt TYPE for 10-15 seconds,, (imo, that length of time is too much to start/stop typing,, should be 5-8 seconds,,) when a key is pressed, the 'counter' starts over again,, as long as the counter is going, the player is invincible,, when the counter stops, the player is vulnerable until (s)he starts typing again, or hits enter,,

methinks that solves that problem,,