I wanted to include a username or other identifier on the form, but I didnt ask the Admins permission to do that, and also thought that some people would feel it was an invasion of privacy. I will add it if it's ok with the Admin.
I had to delete and re-add some entries because the continent field was not originally included on the entry form, and people were writing "USA", "United States" or "US" and it was creating a different country for each of those entries and was making the graph look too convoluted, although they were all USA entries.
@clackey would it be ok for me to add the username field to the data entry page, or some other identifier?