Instead of only having physical object buttons, have buttons that can appear on the visitor’s screen.
Could be used for things like changing POV, game functions, huge number of possibilities.
Can have on-screen button volumes where on-screen buttons only appear while you’re in that area.
Could be a cool idea, but how would you be able to trigger the screen-buttons? Holding a key to show-up a cursor?
Yeah exactly something like that. Or just having a cursor while in the volume lol.
Then you would be frozen while you have a cursor on your screen, just like opening your inventory. 
Ya that would be the tricky part to figure out. I was just trying to think of a way to have a condo experience with different POVs with a toggle you could use without moving around.
My best way to get this thing is a new volume that triggers only when you’re inside, but once you step in, you are frozen and have to click on-screen elements (considering you have added somes) and then you’re unfrozen. But you can chose to reset the trigger or have this to trigger only once.
Can works just like the actual IO trigger volume.
Hmmm..
Yeah maybe with an exit button that teleports you out of the volume 
I think it would be similar to how camera volumes work now