I have tried using the plugin menu and it works for removing/adding chocks (and I forgo using the hand signals for starting engines). However, when you select the phone or fuel via the plugin menu, it brings up an empty window with no options.
I know the development team is aware (they have been very upfront about the VR capabilities) and I have established a workflow that seems be adequate for using the plane in VR. I typically do everything in 2D (start in the FBO, walk to the plane, do most of the checklists). I only go into VR once the passengers are inside and the door is closed. Also, when I am flying, I don't use the sat phone to call the FBO (it doesn't work in VR) and I wait until I am on the ground and through checklists to call the FBO to pick up passengers (otherwise they will still be on the plane next time you fly if you leave from the same place). This workflow seems to be good for me, and I know that over time they might look at adding the ability to access windows (fuel, cell phone, etc) inside VR.
The hotpots tool is a good one. Especially for creating one near the door and maybe another near the lights/PA controller in the galley.
It seems a good number of us fly in VR and it's always nice to see developers out there give it some attention. With the lower(ing) cost of VR hardware and capabilities of systems increasing, I would guess that more and more people will pick it up.