It would be really useful to be able to “add” (or even edit) the basic information used to classify plugins where their basic information (vendor and Effect/Instrument/Other) are incorrect or missing. There are examples where multiple vendor identities have been used over released, and plenty where Cantabile is not finding if Effect or Instrument (typically for effects).
It would also be nice if it were possible to “auto-fill” the tag information for VST plugins based on their VST classifications (maybe by a menu action for a selected plugin or ranged of plugins) to help with the tagging process, but users must be able to edit these as well.