Ability to put away both the primary and secondary weapon. If a player has no primary weapon, lowering his pistol still looks too weird for out-of-combat situations. Adding a holster action in a way that while either weapon is currently in use you can holster it without drawing the other one would help this.

player addAction ["Holster weapon",
{player action ["SwitchWeapon",player, player, 100];}];

This works, so why can't we have it as an available action?