I was asked a question today that I didn't have an answer to. There's a requirement to tag all documents uploaded to any document library within the web application with a selection from a choice field. IE: user uploads document, selects one of the choices as part of the check-in.
My question is weather I can use a feature to add that column to every document library within the web application. The issue of adding it to new document libraries isn't a huge deal, but retrofitting all of the existing libraries would be a bit of a chore. I built a site column so that the choices would be managed from a central place (though that's site specific not web application specific), can that be applied to document libraries via feature?