This is not a suggestion to change the main quest. My suggestion is that there is something that lets you know what the main quest is. Maybe a little icon, or possible some text that says "Main Quest". I like to get multiple quests at a time (gives me some options when I am bored) so it might be nice. At times both my brother and I forget which one is the main quest. I figure this will be a helpful little tool.
Anyone in favor of this? This would mainly help the people who get multiple quests, rather than just focusing on just the main quest... Either way, it is a simple, yet helpful addition in my opinion.