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1) Actually, most of the filters have sliders or manual adjustments you can make; not every filter works on an edge.

2) I think you hit on it. Max Threshold. There just is a maximum size for the effect. To be honest, I have never made anything for printing that large, so I didn't realize this. I did not mean to insult your knowledge or experience, so my apologies. :redface:

Perhaps someone will read this thread who knows or can come up with a workaround for you. Maybe there is a plugin that can do what you want; there certainly are a variety of them.

PS: I posted my reply before seeing jay's. Here's a guy with a few years more than I have of Photoshop experience.

I'd like to see your results.