https://dev.bukkit.org/projects/simpleattributes|With this plugin you will have the ability to put attributes on items or weapons AND EVEN MOBS .And what this means is that you can give players or mod attributes like when a players holds a {attributeded item} that players gets 20% speed boost or something like that. With this players can make custom items with special effects.SO this should be added.
https://dev.bukkit.org/projects/attributeeditor|Also this one might be better than the first.