It would be great to have an additional selection box in the support material section that gives control over just the Dense Support Layers. That way we could use different material for what is going to be actually in contact with the print without wasting tons of material printing the entire support structure.
This is especially useful when using expensive filament for supports because of some unique mechanical properties. Then you only need to use expensive material for the part which actually comes in contact with the print.
This feature could also be achieved with multiple processes if the Support Material Infill Percentage setting could be set to 0% See the attachment for a somewhat effective workaround.