I sent this in email back in 2010, quick response back from Sena that they would look into it, but let's see if other would be interested in the stock cigarette charger replaced with a powerlet/cigarette charger plug like this:

http://www.powerlet.com/product/plug-to-fit-powerlet-cigarette-sockets/279

At least BMW and Ducati's have powerlet sockets.  It can't be too difficult or expensive to have a different end cap so powerlet can be supported out of the box.