If you set it to zero, you also need to change the value in I belive Game Constants, or the one next to it for movement speed to be able to go below 100.You can also set it's movement speed to zero, if you wanted the unit to still be able to cast and attack. And yes, that's how the stash in the Orc Campaign RPG works (although it just has the inventory ability).
Just make it a building...Thx Zell I've had a this problem of the storage chests moving and it was driving me crazy! +Rep