I am using your SR10 in aviation. It is surprising how much clutter the headset cables are. So I have the SR10 connect to my aviation 2-way radio via the open end cable. I have the Peltor headset BT connected as well as my cell phone BT connected. I also (although not recommended by Sena) have my MP3 player connected to Aux 1... I all works great!! (for me).... except for the passenger.
I would gladly sacrifice the cell phone BT connection for a second headset.