Helix as Sweep parameter and category

Hi All,
I’m trying to define a spiral column using dynamo to create the geometry. I have three questions about this process:
1-Is it possible to define a category more related to the real function of the element (column) in this moment is still a mass
2-Is it possible to define all or some parameters of dynamo script as revit family parameters?
Thanks you for any help
3-Is the there a way to develop the helix counterclockwise?