How to use V11 shaders?

[Orgoneotron]

I've found out more about the '_metal' files, the red channel contains the metalicity (how meteal the texture should look), while the alpha channel contains the overall shinyness. To convert a hook 5 'spec' texture to use this system copy the green channel to the alpha channel, as hook 5 spec texures also used the red channel for metalicity. The green and blue channels appear to be unused.
I haven't managed to get a '_glass' texture to do anything, and I still have now idea how they are supposed to be used. I'll continue my experiments.