Why the heck I don’t see “user” type to chosse in maya 2013. It has “custom” instead.
Anyway, if u using mia materials, them go to your area light, change the type to “rectangle”
, mark visible and set the type to “user” or “custom” again.
In the mia material, if No highlights for visible area lights is checked, them the specular won’t show. But that only works if u are using mia materials.
Other materials like phong or misss will still show the specular from this ambient light.
I guess when you put the ambient occlusin as a light shader, the ambient occlusion shader controls the light, and give this specular always on for the materials, so you have no control of that.