Hi!
I'm new here and STK is the best opensource game I know!
I love it!
I use two screen with my PC.
I use arandr to set dual-screen, and run AMD drivers (because of my distro) with AMD Radeon HD 5450.
For now STK run without problem on screen one and just don't use the second.
I'm dreaming about an option set one screen for each player!
The first screen for player one, and the second for player two.
Then, a free software will do best than any commercial thing for multi-player game!
That will be very good!