For HDR I use the an accessory called the TriggerTrap. TriggerTrap connects your camera to a smartphone and allows you to do all sorts of neat tricks including HDR. I find it useful as the bracketing (at least in my X-E2) only allows for 3 shot HDRs with one stop range. TriggerTrap allows you to do just about anything including long exposure HDRs. I have also used TriggerTrap to set up time lapses, high speed photography using a sound sensor, and as a normal trigger/bulb timer.