I don't have time to try experiments, but here's a suggestion.

Use both a Specular node and a Blinn node.

Use an Edge_Blend to blend between them, with the Specular connected to the middle part and the Blinn connected to the edge part. Try various settings of the falloff and see what happens.

I suspect that may look strange, though, because it will probably make the specular node effect asymmetrical.

These nodes are just simple wrappers around low-level RSL constructs. The thing that was not promoted to Poser Nodes was the lighting loop. If we had a lightling loop node that called the things connected to it multiple times, once for each light, and added them together, then I could make any kind of specular I wanted, and also a cheap SSS. Damn it.

---

Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)