I am still trying to understand and figure out how to use ttk in paraview.
In the video i am waitching which is video created by paraview itself, sometime narrator is selecting scalars as pairidentifier, sometime persistance and sometime pairtype.
Otherwise, I think we could have a sub-category for TTK under ParaView Support. I don’t think it rises to the level of a top-level category. We could have other subcategories as well potentially - see how the Slicer community does subcategories: https://discourse.slicer.org/.