I find data dam very useful in many situations but I sometimes find myself setting it to avoid accidental overloads when I am rewiring o rebuilding some part of the code. Altenatively I sometimes select some geometry and disable it. I can live with it but I think a dynamic data dam in the interface could be much faster. I imagine something like the crop tool image editing, allowing to select a portion of the definition inside of which it will run, disabling what is outside. If this cropping region touches the border of the canvas then it can be assumed as infinite. So for instance if I only drag the right border in, all the definition to the right of it will be disabled, but not to the left. So I can rewire and the reset the area or allow the data to flow once.
I don’t know if the explanation makes sense but in my head it looks great