OK! So, as i said, its just a basic aimbot detection, yet.
Players get scores for 2 things: snap, and then kill, or kill then snap.
SAPP checks the camera change in every 0.01sec. Minimum snap is 7.5° (PI/24), the faster he kill after the snap (<= 1sec), or the faster the snap after the kill (<= 0,1 sec) the more points he get. Players get more scores for snapping after kill than snap and then kill. Also, the players get more scores for bigger snaps, this grows exponentially.
I plan advanced detection, luckily i have the source code of evilaim, so this may helps a bit. =)