Not really, it's just meant to transfer stuff that you can carry in your pack. Also, this script was written so it can be used on both RunUO and OSI; RunUO doesn't have this particular "feature". (never mind, I'm thinking about cutting it en-mas, can just send pile of uncut hides; still has to fit in pack)
That said, you can easily add the leather type to the BOS_ITEMS variable.