I've been using Save for Web frantically in the past (typing and tabbing through the values). I used the Generate approach, but never liked the idea of using layer names, and always had trouble remembering the syntax. (I often created a flat intermediate file to be able to use it.) Now we have Export As for art boards and all, but it only offers decimal scaling values to be set. And there's also a glitch: the value of feathered masks aren't scaled.
I'd very much like to be able to define a series of pixel dimensions in this Export As dialogue, and be able to carry a series of settings over to another document.