See I've had the exact opposite experience where some jerks were all up in my face because I only had a shotgun slung, and they quickly changed their tune when I wipped out an AK, so it goes both ways really. For realism's sake though, I agree that anything bigger than an AKS-74u, MP5k or UMP shouldn't be feasibly pulled out of a backpack faster than a slung weapon.
The idea is cool, but I voted no because I don't want to download a 1gb trashcan only to use the one non-expired sandwich that was thrown into it. Unless this can be rummaged for more lore-friendly decent additions, it's not worth the download.
Thanks for all the information guys, very useful to have a little bit of knowledge of what's happening behind the curtains. Now I guess I'll just have to sacrifice some goats to the loot gods. ¯\_(ツ)_/¯