K should key all changes, including slots and images. I think it only does bones currently. I've noted to fix this. Also, implementing setting color for multiple slots at once is on our list. We'll also add a hotkey for visibility, so you can select many things and change them all.
Not sure why you would have to repeat these actions per animation? Changing the setup pose should be enough. If not, you can do it once and copy and paste keys to other animations.