What I want to do here is create one of those multiselect fields where you have one box containing a list of authors and another containing a list of selected authors and you use arrows to shift authors betwen boxes.
To further complicate matters, I'd also like the possibility of adding your own authors (including additional details like email addresses that won't appear in the main multiselect field).
And one final restraint: all of the above must be a complex required field (you have to either select an author or add one).
So is there any easy way of doing this in SS? A module maybe?