1. Good idea, I’m always hesitant to add more hotkeys to keep things as simple as possible, but this one definitely should be there. Will be added for the next update.
2. That’s a temporary workaround done on purpose on Vive due to a bug in Steam VR that leads to overbright colors with Crystal Image. Valve already fixed that bug in the beta Steam VR, as soon as this fix makes its way into the normal Steam VR, the workaround will be removed. In the meantime you can still enable Crystal Image manually if you use the beta Steam VR, but it always gets reset when a game is started.