First, the easy stuff:

*More sorting tools, including ability to sort by matches that actually have a common ancestor.
*Ability to make notes for each match
*Ability to make a private tree open to DNA matches only.

More technical:

*At least enough raw data for comparison. Right now I have a match that is strong and close. We cannot find a common ancestor. If I knew which segment of DNA matched us and could see if my confirmed ancestor DNA matches had the same segment, then I would know which branch we need to focus on. Instead, we're both flying blind.'

*Also, as said before me, I have a match that I am connected to in two ways. One way, is no big deal. The other way, would also wrap up the loose ends on research that's been going on since before I was born and still hasn't been proven.