Team Up should have an option to prioritize friends list.
It is so annoying to be questing with my friend, and have to do the whole "Alright click the Team Up button in 3...2....1."
In higher traffic dungeons such as Darkmoor, the trio in Aquila, and even Waterworks, we often need to take the 10 minute penalty due to being separated and leaving, regardless of our countdown efforts.
I feel that this sort of functionality would be somewhat simple, and would make a great feature in a Quality of Life update.