The problem I have with this kind of setting which effect the persisted format is that we so far are not prepared for changes. Say a user has started with "type" and then after a while changes it to "documentType", then we'd be in trouble. I think many users would expect it to just work. Sure the user could update existing documents etc. but IMO it opens a level of complexity and need for explanations which I'd prefer to avoid for the time being.

We will offer column name changes as well as general purpose document structure migration in the future but we cannot tackle everything with the first shot.