Another vote for a 6th gear and cordless intercom. I also think that 1st gear is geared way too low. It's just so goosey in 1st gear, that when I'm stopped at an intersection where I need to turn, I'll start out in 2nd to avoid the jerky start and swinging too wide on my turn. (Could be me though -- I've only been riding the Wing about three months).
A taller ratio in the final drive would fix that without having to add another gear set.