I'm thinking of an arrangement where if two mappers have plots bordering one another, they will have to coordinate the various aspects between themselves. People will also have the option to reserve or block the plots bordering their working plot to either avoid having to coordinate with another person or to continue their work themselves. Blocked plots can block for two mappers (in the case where each person has a plot to either side of the blocked area), where as reserves can block for only the mapper who reserved it. People will be able to work on whatever they choose within their plot (so they don't necessarily have to map the whole thing, they can map an odd sized chunk if they wish). Upon release the unmapped part will go back to the plots available and someone else can pick it up if they wish. This means over time the plots will slowly change their shape. The purpose of all this is to ensure that the maps will make sense in a continuem, as the plots will either have a finished map bordering them, or untouched territory bordering them, or a person who they know they have to coordinate with boarding them.