Very excited that we published our fisrt plugin today which allows users to create an extra window next to the Spectator view that can contain Unreal Engines UMG widget. This way you can control or configure a VR experience at runtime.
We have already used it for a game in a medical research, where the researchers can adjust settings while the patient is using the VR experience. And we also used it for architectural visualisation, where we can change materials, colors and teleport viewpoints.
you can find the plugin here: