Switchable Negative Prompt

Some of the models allow a negative prompt in the settings. It would be helpful if I could enter a prompt that would be useful for most of my image generation, and then disable it for images where it wouldn’t be relevant, instead of deleting the whole negative prompt and then entering it again when I need it the next time. 

So a switch next to it, like with the other settings, would be fabulous. 

Even more perfect would be the option to have multiple negative prompts, each one with a switch next to it, just as multiple custom system prompts are allowed in the text chat settings panel!