allow editing a map in real time with other mappers for collabs. These maps will automatically resubmit with every changes made unless the creator wants to reload his local copy. Similar to google docs, you should be able to see where other users are focusing on or editing at the moment. Colored arrows on the timeline could be useful here.
A new chatbox could also be helpful for people editing the same map.
A new chatbox could also be helpful for people editing the same map.