I don't know if "faking speculars" is a good expression for that. After all, speculars are faked reflections, which are nessesary because normal lights aren't visible. 

BB explained how to get a working glossy material at THIS THREAD. It does have reflection, so it works in IDL.

 

*Edit:

BB did beat me on this, crosspost. 

A ship in port is safe; but that is not what ships are built for.
Sail out to sea and do new things.
-"Amazing Grace" Hopper

Avatar image of me done by Chidori.