This is a simple request that will enhance the game.
It would be good if you could holster/put away all your weapons (so your pistol is in the holster, and any primary or secondary weapon is on your back).
This tweak would be good for situations where the character either doesn't want to be in a threatening position and/or just doesn't need a weapon in their hands.
It would improve immersion and realism. Just an easy tweak that will make the game more enjoyable overall.