Nah, that's not what I mean. In default RM, similar items are stacked together (i.e. Bronze Sword x5). What I mean are things like "instanced items" (i.e. Bronze Sword is displayed 5 times in the menu, signifying each sword is unique). This is what you need so that each weapon can have a durability attribute attached to them.
I remember trying one script with Blizz-ABS before that was not entirely compatible. Bronze Sword has an index of 1 in the database. You configure the weapon in Blizz-ABS (editing part 1 of the scripts). Then when you obtain a Bronze Sword in-game, its ID was not perceived as 1, so it was not using the configurations set in Blizz-ABS.
Unique items are also pretty nasty to make compatible with custom shop-like systems such as crafting scripts.