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Yes, it does.

Good point. That would be far easier.

Does that allow the player to switch back to another weapon, though? It's been a while since I checked, so I could be mis-remembering, but I thought that caused issues with weapon switching...

Actually, just setting the owner's pending weapon to null works too.

class NullWeapon : Weapon
{
    Default
    {
        +INVENTORY.UNDROPPABLE
        +WEAPON.NOALERT
        Weapon.SelectionOrder 99999; // Make this absolutely last in weapon priority
    }

    States
    {
        Select:
            TNT1 A 1 A_Raise;
            Loop;
        Deselect:
            TNT1 A 1 A_Lower;
            Loop;
        Fire:
        Ready:
            TNT1 A 1 A_WeaponReady(WRF_NOFIRE);
            Loop;
    }
} 

We use something like this in Blade of Agony:[code=php]class NullWeapon : Weapon
{
    Default
    {
        +INVENTORY.UNDROPPABLE
        +WEAPON.NOALERT
        Weapon.SelectionOrder 99999; // Make this absolutely last in weapon priority
    }

    States
    {
        Select:
            TNT1 A 1 A_Raise;
            Loop;
        Deselect:
            TNT1 A 1 A_Lower;
            Loop;
        Fire:
        Ready:
            TNT1 A 1 A_WeaponReady(WRF_NOFIRE);
            Loop;
    }
} [/code](ours has some extra handling built in, but this is the core part that does what you're asking about)

Then, in the player class, we have it assigned to weapon slot 0. So pressing zero, or switching to NullWeapon in ACS lowers your weapon.

I think the best way to do this is to have a "null weapon" which can be defined by the mod, itself. I am not sure how much merit this would really have as an engine feature.

Just thought it would be a neat idea to have a holster weapon function
It could be implemented someway in a mod or something

On an unrelated note, does anybody else find it awkward talking to a friendly NPC while holding a gun up to their face?
[spoiler]I had no idea what to put in the thread to start it off[/spoiler]