Clearance Family Category and Features
Please provide a built-in clearance family category. Please provide features for this category such that Revit knows how to treat clearance when running interference checks. Allow this family category to be nested within other family types and it still be seen by Revit as Clearance. When running interference checks, Revit should have the option to ignore clearances clashing with clearances. The clearance category should be able to have subcategories, just like any other family, so we can define working clearance, dedicated space, installation clearance, etc.
Also provide a new material type for clearances. Especially one that will still be transparent in Plan/RCP or Elevations, and one which will be transparent when cut. (In fact, all transparent materials should be transparent in this manner.)