Quote - Specular is probably always going to be a bit of a nag, but at least it's pretty easy to control (create one or more lights with black Diffuse color).  You can even do a specular-only pass (or multiple passes, if you want), just turn off all the other lights that have non-zero Diffuse and turn off any Ambient materials.

this is my approach now.if i use studio lights then they are all round. so i render first out everything only specular with one specific settings on blinn. then i change every blinn and render again. that way it gives the illusion that one light is bigger then the other.

if only we could use an image map to tell the light what kind of shape it is. not for diffuse. but for specular. like in this paper from pixar:
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