Set which layer is selected by default when opening a map

I would like to be able to designate a specific layer to be the default current layer when opening a map.

Use case - for example, when I'm creating a city, often the first thing I want to do when I open the map is lay down some buildings. But, my first object layer (the lowest in the order) is terrain features, which I need to have below the buildings. The program currently seems to default to the lowest object layer. So, every time, I end up laying a bunch of buildings on the wrong layer (because I forget to change it), and then having to find, select, and move them to the correct layer once I finally notice I've made a mistake.