I get that this feature is not possible in any of Rockstar's games but some of us don't like having all 50 guns in their weapon's wheel.
A simple gun storage in camp would be an easy fix for this, haven't really been progressing in this massive game but i know this will keep bugging me throughout the playthrough.
I had to wait for RD2 for the fix of auto holstering the gun when not aiming in RD1, please don't make me wait for RD3 for this to be fixed.