I'd like to, but I'd need to go through dozens of projects (or hundreds, to be thorough) for each numbered entry.  If I allow the current 12 items, that means 200-2000 lines that have to be evaluated to place the template - unless I remake it with named parameters.  (en=yes, wikisource=yes, etc.)  But that's different enough that it might as well be a separate template and a fresh start.  Still, thanks for the feedback.