Arbitration background in real life here. Love what you are doing and want to offer some feedback! Many times in larger transactions, parties will demand a panel where 2/3, 3/5, or in exceptional cases even 5/7 arbitrators agree on a verdict in their case before a decision is rendered. Adding functionality to support multiple parties would be huge!
Additionally, there is an international treaty called the NY convention that allows for arbitrators' decisions to be taken to local courts for enforcement of non-monetary judgments. It would be amazing if you built in an option for public parties (think apple vs samsung) who have decided to use bitcoin as a payment in an typical contract to verify their identities so that the bitcoin portion of the arbitration could be included in enforcement of other elements (sometimes courts require dditional penalties/fees, or physical performance of parts of contracts in addition to the money settlement). Having verified identities here would allow for courts to take into account whatever payment decisions the arbitrators make.
Keep up the great work!