I think we all have this on our minds, it's certainly not forgotten. We know that users want ways to compete with each other, and we feel that's important.
There hasn't ever been anything on this, and I think it's a great idea. I'll pass this off to a staff member.
It's been mentioned numerous times in the quest feedback thread and a few other threads have been made about it already, so I'm sure they already know.
It hardly makes a difference. The most amount of legacy anyone can have is 21 and that's gold king, I doubt many people have more than 12.
Right now it makes a bit of difference but as more quests get added it will matter less and less. I guess you could do 2 leader boards. One with legacy and one without. I don't think we would really need two but if enough people complained about it I bet they could easily do it.