User Activity

Is there a way to get the camera to create a different file name for the stacked jpeg? If multiple stacks of the same subject are taken, it is hard to distinguish the individual frames from the final stacked image. 
I want to use AEB to get 3 bracketed shots.  In low speed continuous I have to wait for all 3 shots to finish.  From what I can find, I have to switch to high speed and hold the shutter button while all 3 are taken.   If I let off too soon there is o...