Oh, yeah, mono sources only for DearVR.
Geometrically it has to be that way, otherwise you're making it like you are basically having four microphones for two ears worth of sound, making things muddy.
I've done both cases where I use thr built in reverb and turn it off, but by default I tend to turn it off.
Which master bus effects are you talking about, specifically? If you have a clean stereo signal, reverb should function almost physically.
My line is as follows - EQ, compression, DearVR, send delay to reverb.
I don't put any mastering on top of those things precisely because of the illusion.
This time around I had no time to spend on really dialing any of that in, unfortunately.