OOTB, Revit has a Fire Rating parameter for only a handful of Family categories. In real life, a lot more Families / objects need to be fire resistant, like for example Ceilings, Columns, Curtain Panels, Curtain Systems, Curtain Wall Mullions, Floors, Generic Models, Ramps, Roofs, Stairs, Structural Beam Systems, Structural Columns, Structural Foundations and Windows.
It's easy enough to add a Project Parameter 'Fire Rating' to those categories, but when exporting to IFC, this will bite you.
So please give more Family Categories a Fire Rating parameter?