This conversation has been merged. Please reference the main conversation: Lightroom: Better auto stacking for bracketing,HDR, and panoramas
Even better would be HDR and Panoramic auto-stacking tools. In HDR stacking tools, LR would look at the exposure data as well as time between sequential images. Of course the options for auto number of images in the stack, 2, 3, 4, 5, 6, .. images in the stack could be entered. I hesitate to suggest that LR check for alignment between images in a stack because this could be rather time consuming.
In panoramic auto-stacking, the exposures would need to be the same (though there could be an option to shut this off). Panoramic would be harder to implement as action could get confused with a panoramic. A truly smart panoramic auto-stacking mode might require auto alignment.
Another tool could be created that shows the images to be stacked together, in the grid view each stack would start on the left of the grid and be surrounded by a box. + key would expand the box to the right, Shift + would expand the box to the left, - key would reduce the box on the right, shift - would reduce the box on the left.
Finally a simple thing (I hope this is simple), when I right click I get the stacking options. Within the stacking options the hot keys are not shown. I only recently found out the CMD G will combine images into a stack.