I have a Samsung Galaxy Tab S 8.4" and I am going to buy a bluetooth keyboard for it( EJ-CT700). I just was just wanting to know how it works. Do I have to have a mouse as well? Or can I just I just use WASD for movement, and the arrow keys for the mouse orientation movements? I know the keyboard can't be changed, just 4 presets, but if anyone has a bluetooth keyboard please tell me what the four different modes do. I really appreciate it.