Apply changes in other direction

<SPC>s syncs all and replaces Search text with Replace text. Results panel doesn't change which is good because if I want to undo one change I can go to that change (the before text) and <SPC>l to change that one line back. Can new function be added that is opposite of <SPC>s to apply all previous changes and we can add it as keymap? And function to swap Search text and Replace text?