Is there any reason to show "Window to small, please expand"? Set minimum window size 1024x600 and we will never see that message .
Also new mode take 10 pixels from the sides. Let me explain. I have 1920x1200 screen resolution and 1918x1080(1px border) SK window. When i start game with new mode i get 1908x1080, so it took 10px for expanding arrows. Could you add button that lock my resolution?