Let's start with the most profound. Reading a directory of Fractal Terrain Output and then setting up the layers to match it. This should also ask for the Web Location, that way it condenses all the input needed into 1 dialog. Should be modal.
If there is only A000000.jpg then obviously there is:
Layer 0, No Submaps, at that picked location.
If there is the default set (1 for layer 0, then 4 (2x2) for layer 1) then there is:
Layer 0, 2 submaps in each direction
Layer 0, no submaps.
And so on.