RFE: Allow priorities to take into account how near tasks are to currently edited tasks

[tsmock]

I want to avoid editor conflicts since, in my experience, an editor will often make a mistake during conflict resolution.

So I'd like to either have a way to "lock" tasks within a certain radius of a task currently being mapped or a way to de-prioritize those tasks (e.g., if no editor working on task within 5 km, then task is high priority, else if editor is working on a task within 5 km but more than 3 km away, then task is medium priority, else if editor is working on a task less than 3 km away, then task is low priority).