I would like to see one (or maybe even two) additional prompt windows and the ability to copy and reuse a select prompt or both prompts from existing images.

That way you can quickly change only aspects of an image.

It should also be possible to have a prompt preset for each dreambooth model. That way, loading a modell could autopulate one prompt with words useful for that modell.

On generation the prompts could be read one after the other, or interlaced (word1prompt1, word1prompt2, word2prompt1, word2prompt2...). It doesn't really matter, but it should be clearly communicated which way it is, because output will differ...