Brushes

It would be nice if different brush shapes could be selected. For instance, in trying to make a castle THAT IS ON A RAISED BIT OF LAND - I wanted a square area but only a circle is allowed. The thing is - what about triangular brushes? or Polyhedrals? Also, it would be nice if just HOW high or low the raised/lowered areas are. For instance, it would have been nice if I could have said I wanted the raised area to be 10ft high (or 10m or units or whatever). Last, it would be nice to be able to load in an image and use it as a brush. Anyway - just a thought. (PS: I used the raised with circular brush and - well - gigantic on one side and very low on the other. Trying it again. 🙂 )