What is the aux plug to feed?
If it is a camp light then the original system wired directly to the battery is OK, but if you are using it for electrical clothing or such, then having it turn off with the key isn't silly.
As I run a GPS and electrically heated vest, I have two sockets.
The GPS is on all the time, while the vest is powered through a relay that is in turn switched on from the ignition, but powered from the battery.
I also have my heated hand grips wired on this circuit, so key off and everything but the GPS is off, = peace of mind, bikes will start in the morning
