After struggling a lot with the first of 4 VRCS2 i was installing yesterday, i noticed what worked for me so that both switches in the VRCS2 can be controlled with ST and with the physical buttons.
I don’t remember how many times i factory resetted the VRCS2, but I never excluded it from the network. I simply couldn’t do it. But i didn’t need to. I started the amber led process with both buttons simultaneously (pressing them for ~10 seconds, and kept them amber blinking) and then pressed the big + on ST app. It found two Z-Waves Remotes, which I added for the time being. Next, I started the amber blinking process with each button at a time (pressing each one for ~7 seconds and kept it blinking) and after a while it found a Z-Wave switch which I added and named accordingly. I repeated this last step with the other button and now I have the two remotes and the two switches added. After that I removed the remotes and everthing works fine.
The only funny thing is that the leds on the button turn green when the loads are ON, and turn off when the loads are OFF. But I can live with that.
I hope this helps anyone.