This comes up a lot. I think you'll get people who want compound buttons, and people who want to invalidate it, with a lot of false dichotomies thrown every way. Like, for example, people will say something really dumb like "It will make the game too easy!"

Personally? I'd like it as an option. I find it hard to keybind GNB and PLD in a way that feels comfortable. I know some people prefer the feel of hitting different buttons, which is cool. Think it is easy enough to please both camps.