Here’s a thought that occurred to me, while I was looking over a character sheet and setup for a Call of Cthulhu character.
In the game, there are a lot of skills to roll checks on. 8 core Characteristics, 2 fluctuating resources, and 46 skills (plus more). Since the spread is so wide on what’ll be rolled when, it feels like the best way to make use of a quick bar with a few slots would be to just have a quick access to the different skill categories.
If a slot on the action bar could be assigned to a category, that would then unfold a dropdown (or fly-out) list of everything in that category, it’d be pretty easy for a player to, say, keep all their combat skills in one group. All their Characteristics in one. All their social skills in another. And so forth.