I think this is a great topic, and never too soon to start considering it :). UX improvements to the map .(like being able to see all my POIs in the same place) dramatically improved how I used it & how I felt doing it.
One of the recent UX improvements I like the most actually has nothing to do with the map-- it’s the daily email updates on current votes, challenges, and new points. What I like about this is it’s geared towards an action a user needs (for example, I want to check and make sure none of my points are challenged!), and delivers the resources in an efficient way (my email).
I wonder if a simple extrapolation of this model could work too-- for example, adding a “focus zone” to the email, where it asks for POIs to be added in specific locations. I think one of the challenges here to me is that it’s not immediately obvious why I should add additional POIs, who will use them, et cetera.
This was a bit long, but I guess I just wanted to emphasize that UX is more than features for the map interface, and is a bigger effort around motivation, how to focus efforts / know how to contribute, and so forth…