When I tried the HDMI output device with the v007 version, that didn't work.Are you sure that the HDMI device selection will output in parallel to the optical SP-DIF ?
I am not sure that's why I ask you to try. If it didn't work with .007, it won't work with .008 - there was no change in how audio works. I will try to add SPDIF output for the next devel build but you (or someone else) will have to test and tell me if it works.