It would be very very useful to be able to display / include components of the Parametric based on an assigned 'Visible - on/off' parameter. See ACAD Dynamic Blocks, Revit and other MCAD apps.

The Constraints tools are great but a lot of Parametric Cells will only require different combinations of components to be included or not.

Eg A door parametric cell would have ironmongery components that should be able displayed/included or not as needed.

This would also make any Imported RFAs easier to use. I think that all the geometry with assigned a Visibility parameter is imported (onto the Default level) making the imported object unusable without major buggeration.