More of a conceptual questions really.
Is there anyway to display and allow filter by all available attributes in every category. For example; in the shoes category, show and allow filter by the 't-shirt' attribute, even though no 't-shirt' products exist in shoes category.
I presume this is not possible unless all products existed in all categories? Which would presumably be an issue for SEO anyway?
I've had a client ask this question and wanted to make sure it wasn't possible before I tell them as much.