It would be extremely useful to be able to create "regions" on a spread footing design with different soil depths.
When designing a spread footing/retaining wall combination, there isn't a good single solution at the moment.
It would also be nice to be able to design a column and spread footing in combination with a retaining wall.
To simplify, you could have a single baseheight for one side of the spread footing and a different height on the opposite side. This would be for basement wall spread footings with large concentrated loads.