It is very useful to be able to select several images and apply global or local adjustments to all of them. However, it can also cause havoc, as I have discovered on several occasions. My workspace has the Image Browser on a second monitor and sometimes I forget to look to see I have not left multiple images selected from a previous operation before applying new adjustments.
So my request is for a warning, perhaps under the central Tool Bar at the top of the main window, that says something like “Warning - Multiple images selected”.
And guess what? It was completely ignored. It shouldn’t be too difficult a feature to implement (1 hour of coding?), and I agree that it would be very useful because I have often made your same mistake.