I am curious about having a Count with Depth that is a custom shape.
1) Instead of choosing a shape, click "custom" from the drop down list.
2) The prompt will have you trace the area of the shape
3) the perimeter can be used to get things like the surface area of the sides when a depth input.
4) the trace area becomes the count shape.
Would be helpful for things like odd shape pile caps:

I fully understand what you are looking for. As a workaround, you could do something like this??
Or put the formula on the area:
@David does the suggestion from @Shawn work for you?
Well what I have done for now is actually used an Area takeoff with a depth, I copied that takeoff area to all the other footings of the same type, and then used the "Section Count" variable to get how many times this footing occurs to count my bolts and such.
