I'm somewhat of a hoarder, so keeping all possible data seems desirable to me. Looking at my house reminds me that others might not agree.
How about a Comment field in proposals?
That could provide information from the submitter to the moderator ("I found this in a sidewalk market in Hong Kong and the name was given to me verbally" or "This lettuce looked like a new variety from an obscure breeder, mentioned no where else I found, and here is his URL".)
I often wanted to say: "This ABC lettuce MIGHT be different from XYZ which has a similar name, since this website described XYZ this way, and all these websites described ABC this different way." So I had to submit the plant's name and Tree-mail the moderator and hope she read them on the same day.
It might have a checkbox for "add comment to entry if accepted".
Is there any kind of information that would be useful to the moderator but of no interest to any other ATP member?
My idea of a "useful" plant entry is one that has information in addition to the names. I wonder what % of our plant entries have nothing in them but a name?
If the moderator thought the comment info was too unreliable or made too many unsourced claims, he/she could accept the plant but reject the comment.
Maybe the Comment fields could be pre-populated with "desired fields" on a custom-database by custom-database basis. Some custom databases might say "Source: (required) " and others "Pedigree: (optional)".