You can use GearVR like normal Cardboard headset, but it requires to use CB Enabler for Gear VR to disable Samsung VR launcher.
If you are Android dev/power-user you can also disable GearVR service with pm disable command via SU/ADB.
CB Enabler for Gear Vr on Google Play
VRidge uses your phone sensors so it will not utilize GearVR built in sensors. We plan to add proper GearVR support in the future. It will utilize GearVR hardware possibilities.