Thought I would post this here. I found a way in SteamVR to access your desktop through the webbrowser. Once I get keyboard support working you will be able to preview your game, go to your desktop and make tweak to a variable, and then return right to your game or relaunch a new preview. This might be a decent stopgap for quick testing iteration until the editor itself gets VR support in the near future.
Here’s a video I made showing it off with the desktop in general, not the unreal editor; once I get keyboard support working I’ll probably show it off with the UE4 editor:
