Looking at the files on disk it seems the AMS coreshaders.mas was updated after version 3.1e and hence I presume the shader was added then. I will try to get that shader in a future release of 3DSimED.
looks like theres a problem with one of the reiza (ams) shaders
if i load a original ams car the shader "rz diffuse ao bump spec cube map add diffuse alpha reflect" is shown just as t1 shader
i have to drop the reiza.gfx into the hardwareshaders folder to get 3dsimed loading the shader right
the shader is just shown as custom and not as ams so maybe reiza added or modified it later... the shader is used on the super v8 cockpit carbon for example ;)