chat vs im chat

for lack of a better way of describing it... I was wondering if in a future update, if you could find a way to seperate in game chat, from ones sent to someone directly? it gets annoying sometimes when you send someone a message direct, but they cannot get to finish reading it (if they even see it) because someone is in the area wanting to sell or buy, or needs help leveling, and scrolls 5-6 lines repeating themselves, maybe a way that if you sent the message direct, it would stay on screen longer, or maybe come up in a different area? so the people u sent a message to will actually get it?just gets annoying sometimes.. esp with how fast the in game chat scrolls by

thank you