I decided to use map.php to check every published hold for disarm tokens (there aren't that many holds, so it didn't take long) and as far as I can tell there are only 5 rooms in published holds that actually have a disarm token in them, they aren't very popular.
If you're curious, these rooms are:
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Cludo's dungeon : Floor one : 1 North
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Hold Anonymous : Third level : 2 South, 1 East
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Nameless Fortress : The Broken Stairwell : 3 South, 1 East
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Unfriendly Islands : Islands : 2 South, 2 East
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Unfriendly Islands : Islands : 3 South, 2 East
Anyway I like changing disarm token to work like point 2) in TFMurphy's post above as it's consistent with how all other tokens work in RPG and makes intuitive sense to me, that if the player enters a room with an active disarm token he will lose the ability to use his weapon in that room until it is changed back.
There are two major consequences of changing this behaviour that I can think of:
1) If a room had two separate paths in it, and a disarm token was in one but inaccessible in the other, then after this change you could be disarmed in the latter path whereas you could not before. However none of the rooms in published holds have this situation in them.
2) A token that can only be triggered one-way to ensure you have no sword in an area could result in you being allowed to have a sword on a second pass through if you can re-enter the room swordless. The Nameless Fortress room linked above actually DOES have this situation in it, I think, although I've not played through this hold yet and so I'm only going by the image and can't accurately assess the impact it would have (makes greckle farming easier possibly). However this situation is only possible because the disarm token in the bottom-left can be freely toggled multiple times, so if we want to make this behaviour change I believe we could slap a West force arrow on top of that token and then the change would have no impact.