1. Yes that's probably the cause.
2. Switch to windowed mode then resize it by moving the mouse to its border then mouse click drag just like normal app window. If you exit the emu, it will remember your previous state for the next launch.
3. V2 shiped with for built-in 3DN Mario, Circle Circus, World Runner, Legend Zelda. Please check the sub folder ./3dn/. More will come when the community start to work on it.
4. In V2 it changes to camera tracking mode. Ctrl + Click the character to track. F2 to switch between normal mode and tracking mode.
5. It took me almost one year to develop V2. It's a long time and the community have finished almost everything possible within V1 capability and feature. That's why it's rather quiet lately. V2 have just released yesterday you know.