1) The cord should exit downward from the middle of the pack rather than from the side. This allows a much cleaner installation so you don' have the 90 degree bend which requires a piece of tape to keep it secure before it gets hidden in the neckroll.
2) The cord should plug into the pack to allow for a quick change rather than having to dig into the helmet for the connections.
3) Larger capacity. Since its external, an optional larger, extra capacity pack could be offered without compromising the overall design of the SMH10R..