I couldn't really think of a better way of describing it in a short title, but what I would love is the ability to use the information uploaded in the map when I am gathering further information to later be uploaded.
For example, if I read a newspaper report about an incident that happened in the "house next to William Henry's House", I would love to be able to look at the map, right click (for example) on the house next to William Henry's House, and automatically have copied the Location ID to my clipboard for adding to my research file.
That way, the next time I update the data in the file online, the new event will be associated with the correct Location ID.
Concievably, it might be possible to have a menu where you can choose what a right click copies - Land Owner, Land use, Occupier, Area, etc.