I have had a little look through and do not believe this has been requested before.
I have just found the feature where you can change the type of cache that displays on the Difficulty Terrain Matrix.
It would be really great to see this visually for both, while I know you can use the map hidden date tool to find the missing dates for the hidden date, it is a little more challenging on the found dates.
So an example might be to be able to show the "Finds by found date Calendar" in profile stats and only see the multi cache finds.