I don't really know if this post is a question or a suggestion that would need to be directly addressed to the create of the very (very) good biblatex package.
It often happen, especially in humanities and social sciences, that a book was firstly published in one precise year and was published again several time to had a preface, notes, comments and even to update some data. In this case, editorial rules may require the author to refer to the book by giving not only the year of publication of the book consulted but also the year it has been published for the time between brackets.
I did not find any way to do it. Would it be possible to add a "firstpublished" field in the bib document that could be read by biblatex package?
Thank you so much