The reason I'm asking is I had an idea. I'm not sure if it would work but it seems like a good idea. I think it would be simpler and all around more compatible to add an extra bone to the skeleton for sheaths and quivers and such instead of relying on a script/taking the pauldron slot. Perhaps even add in several different bones so your dagger would not be on the same place as your quiver, bow, claymore, or even shield. The sheathing could work with an animation replacement. People are still making those, right?
...Right?
Edit: And suddenly it occurs to me I wouldn't know how to get the game to tell the difference between a dagger and a claymore, but I never claimed to know what in hell I'm doing.