Stop extrude cutting through solids
                    Although it can be useful, I would like to prevent extrude cutting into other solids. I would rather deal with junctions after setting out the walls and slabs.                
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There are 2 options in Settings.
I personally use to have cutting off.Should be DEMEXTRUDEMODE
(with Default Value 3 (?) )0 - 
            
It's the DMEXTRUDEMODE system variable indeed that controls the intersection behavior of DmExtrude.
Please notice that you can use the Ctrl-key to cycle all possibilities: create, unite, subtract.0 

