Being able to set more than one image to 'Set as Compare'

What problem do you see this solving?

When shooting tethered it is helpful to choose an image to 'Set As Compare'. However, I don't see why this should be limited to only one image.

When was the last time you were affected by this lack of functionality, or specific tool?

This is a regular issue when shooting tethered. Sometimes it is necessary to be able to view more than one image in addition to the new capture while shooting. Being able to set, for example, three images to 'Set as compare' would allow for the fourth image to change as it is captured. This extra bit of functionality would be very helpful.