Look into how exactly the item stats are generated on the weapon/armour pages and look into adding "Has itemstat id" so that it will be possible to enter the ID and get the correct prefix (EG for givers).
Specify somewhere which expansion is required for a prefix. Some items (PVP vendor armour) has different verions depending on which expansion you have so they offer the right stats. A subobject template will need to be made that spefies the item ID and lists which additional prefixes it provides. Currently they're all for HOT which is no use for a F2P player.