That's not Really the right attitude towards it mate, To make things clear for you, it is possible and if you don't like the idea of it don't read the ticket or comment on it. End Of. Lets try and keep this on a Positive track shall we?

We have to keep in account that this is a 3rd generation Military Simulation game, Even If you don't have an Animated Weapon sling it should be quite simple to make one appear across your neck/chest when changing weapons. It will at least show signs of an Attempt to make the game as realistic as possible.

There should be no reasons why this should not be done as it is a Simulation Game, It's easy to sort out and increases the realism.