Use Trinus VR and you have tons of options to set individual eye screen sizing, screen offsets, screen distortion, X, Y sizing etc. I don't have Gear VR but I tried tons of different software with other google VR head sets. Trinus is the best, you can run every pc game with it. Even you can run games that don't have Stero option. Trinus has the option to split screens for you. If you want true 3D effects then the game must support Stero option like in DCS world. Well you can visit google card board thread in my sig for different alternates.