Well I have a template file I use when I create buttons that has all the states labelled on separate layers so it's never an issue. The only time I do the 1- trick is when I'm getting graphics from someone else and it's not really a big deal for me. I would be handy to have a flip feature I guess but I don't think it's going to be a deal breaker for most people - especially if they're coming from a Kontakt background