I have been playing on a bending minecraft server where they have rewritten Orion's bending plugin, and they have implemented some nice things. Firstly, when a player has moves bound, they have a sidebar (using scoreboards I assume) with a list of bound moves and what slot they are bound to. This is a very nice touch that makes for easier bending, so the bender doesn't have to memorize what ability is bound to which slot, or having to constantly do /b d. Another command they implemented was /b b all. This command instantly binds all the moves of your element to your 9 slots, which is a nice time saver, automating the process of binding your moves.