Fujii-san has reminded me of the fact that we do not show in \df+ the parallel status of a function. The output of \df+ is already very large, so I guess that any people mentally sane already use it with the expanded display mode, and it may not matter adding more information. Thoughts about adding this piece of information?
It has 11 columns. I don't see any problem to show few columns more. It is better than missing important information.