Mike, it seems to me that the best solution in this case is for you to ask the people proposing new tomatoes to provide you with the extra information you want: "Source (where they obtained it or where it is offered), History or Pedigree, and References (links to more information)." You could do this by sending a tree-mail to the person or by declining the proposal and then including a request for this information in the explanation provided with the decline message.
