There aren't any VIs available to programatically read the IMAQ configuration files from MAX into LabVIEW. Like you mentioned in your original post, the best way for now is to put IMAQ Init VI in a for loop and go through the possible cameras (img0, img1, cam0, cam1, etc), checking to see if there is an error or not. However, I will let the developers know that there is interest in this capability.
Julie S.
Applications Engineer
National Instruments