I tend to play Fallout in 3rd person unless I'm in a building then I switch to 1st, but I have noticed that you no longer seem to have your weapon on display, holstered when not using it, it just disappears when its holstered, for me this takes away some of the immersion I enjoy in the game, hoping a Mod fixes it.

If you keep your weapon out instead of holstered, after a while you will walk along with it lowered instead of raised. I understand what you mean regarding holstering but hopefully it helps the immersion factor.

I had a mod for skyrim that added backpacks etc so maybe someone will mod this into the game, holsters and backpacks would be cool.