Custom Preview

Awesome! Thanks for a great plugin.

Just a question, I am trying to make my view port look a bit better for live demonstration, but I cant seem to change the colour of the SelPV preview. It doesnt seem to respect the global "Document preview settings"

1. Is this a bug that just I am having
2. Is there another solution?
3. Can we add a shader input for unselected / selected preview?

If your not too protective over your source, I would love to give it a quick bash. 

Kind regards

Theron