1. view a list of to-do items, sorted by proximity to a location (typically where you live, but could also be a place you are visiting).
2. add a comment/status, similar to "errors".
3. add a to-do list item.
Obvious example: gravestone confirmation. More involved: library visit, check specific item in specific record. Another one: is there a corner stone with a date on the building at an address.
There could be a karma-point system. People may be more inclined to help someone with high karma points? You get a point when you claim success on a to-do item. Item creation instructions should include how to precisely define success.
Separate list, similar idea: sources that are not online, e.g. a published genealogy one does not have a copy of, and is unlikely to be in a library.