I find \df+ much less useful than it should be because it tends to be
cluttered up with source code. Now that we have \sf, would it be reasonable
to remove the source code from the \df+ display? This would make it easier
to see function permissions and comments. If somebody wants to see the full
definition of a function they can always invoke \sf on it.
If there is consensus on the idea in principle I will write up a patch.