They no longer work for VR.
The display used to act like a nother screen, but since the 1.3 update, it only works in the "direct to rift" mode... I know some people have expressed that the creator add in a .dll or something to allow it to hook, but they responded that they did not feel like working on something that has frequent updates and will either wait till the code does not change as much and also that so few people use it that they don't think it would be worth their time to even work on it.