Toggle for a Map Overlay to Show Mine/Dump Designations (only)

Recommend a toggle for a map overlay to show mine/dump designations.
This is the same same overlay used when designating digging/dumping locations. It is also already used when placing a building, or when turning on the Layers overlay that displays the resource reserves.
This recommendation, however, is a toggle keybind/icon (like Layers) that allows the designation squares to be seen all the time in the "normal" map view in the same way as the Layers view works--only without the distraction of the resource reserves.

The Overlay Dialog should only be displayed when I am changing the view of something. Then it should disappear like the other dialogs when you click elsewhere on the screen.
Like mentioned above, there should be keybinds for all the items on the Overlays screen. I quite often want to turn the Small Grid on or off, in addition to separate keybinds to turn on the Mining/Dumping designators.
Finally, the settings should be all set to Off when starting the game, and should be remembered in the Save file, so that I don't have to uncheck all of the items I don't want every time I start the game.