Well, you'd need at least 3 additional animations for both, the player and the world-gun model.
1. aim while crouch
2. aim while stand
3. aim while move
However, I don't see how this would help, since you still can't look at what is happening behind you, no matter whether the animation indicates a mate is scope-ing or not. In the end it's the guy with the sniper *coughjuststopthecampingandthiswillnothappenthatoftenanymorecough* to watch out for mates before shooting.
1. aim while crouch
2. aim while stand
3. aim while move
However, I don't see how this would help, since you still can't look at what is happening behind you, no matter whether the animation indicates a mate is scope-ing or not. In the end it's the guy with the sniper *coughjuststopthecampingandthiswillnothappenthatoftenanymorecough* to watch out for mates before shooting.