Yes, you're meant to be passive. Stamina has been fixed, the code wasn't changing from the default value. Exhausted runners can now also reach the goal. Collision detection is at the top of my list to do for the next version, followed by improving the runner's state machine. I'm still brainstorming ways to fix the exit, but maybe I'll just have runners that go over die. I might have some limited way of effecting the races but not extensively. The stat picker is completely temporary and not going to be around long, a big part of the game will be in the eugenics subsystem. A level preview will be in the finished game.
Thanks for the in depth reply. I've upload a build with the bug fixes.