Material Based Occlusion is possible inside Ds3 Adv through either the Shader Mixer or the Shader Builder. But you have to build it by your own (or use a tut somwhere else).

I've added a dbm file for the Shader Mixer (open Shader Mixer then File load...apply to surface) which is a very simple Material with occlusion

[EDIT] It seems that I can't upload such a file. Do you now a place where I can?

 

Regards