I would like to re-address this need.
We use databases for wikis, however some of our users are… stubborn… and fail to remember that they should press
instead of 
. It would be really handy if we can protect our users from themselves by disabling documents (and other entities such as whiteboards, views, and dashboards as well).
I can see that you might not want to disable it everywhere, as there is a use. However in our wiki tree based smart-folders, there is no place for little documents floating around.