At this point interior reflections are not yet supported (but I am working on it) so it's better to stay in a regular DX7 alike mesh/material setup for now when doing VC stuff. If metalness shader is used then interior material smoothness should be rough enough that no reflections are displayed.
EDIT: I have noticed that the "pick" doesn't always work in a VC environment, it's probably picking something that's behind camera. I'll have to check what's wrong with the "display mesh group" option. These issues are likely fixed when I am able to create the new version of the mesh debugger that's in the plans.