I believe to make a Surface filter look more like a Simple filter, I think you also have to make sure that the height map is a flat tone/color. (And even then, I think the Surface Lighting settings may need to be adjusted "just right".) If the height map isn't flat there does still seem to be some sort of embossing effects going on (even when the 3 surface settings are at 0). (At least, from what I remember.)
Plus assuming such a set-up works, if you use the filter as a "simple filter", I think it might be much slower than if it actually was/had a switch to a simple filter...
By the way, Kraellin, you might be older than me, however, I think I could give you a good run for your money in the senile department.
P.S. In Photoshop, I often adjust the results I get from FF's surface filters. Here, it would be cool if I could still make the adjustments in FF (where the surface effects were treated like any other component). However, I think this has been previously suggested and shot down as impossible/impractical.