@wb: nope, my suggestion wasn't that the keyboard isn't used, if you reread what I said, my suggestion was merely that the buttons should be labeled with their gaming letter ABXY larger than their textual PgUp/PgDown function (currently it is reversed). I suggested that the gaming functionality is used 1,000% more - the 1,000% is pulled out of the air, but as it goes, from looking at the top 10 download list, it actually has some basis. So at this stage I think it would be down to you to provide some evidence that PageUp/PageDown are in fact used more by the majority of people.
Regardless of how those buttons are (or will be) used the most (which is rather hard to investigate):
why would larger ABXY labels make them more suitable for gaming?
Are the symbols "A", "B", "X" and "Y" somehow intrinsically more "gaming-like" than the symbols "⇤", "⇥", "⇞" and "⇟" ?
Thought experiment: I'm making a platformer, and my game actions are "jump", "shoot", "drop mine" and "activate shield". What makes most sense, pictographically: "Press ⇞ to jump, ⇥ to shoot, ⇟to drop a mine, ⇤ to activate your shield.", or, I dunno, "Press Y to jump, B to shoot, X to drop a mine, A to activate your shield."
Thought experiment #2: I'm making an RPG, with lots of menus; the game actions are "confirm/continue/enter", "back/abort/leave", "menu/inventory" and "action" (do something here: pick up an item, drop an item, talk to someone etc). Which symbols would you rather put in the help screen / GUI hints? ⇤ Back, ⇥ Confirm, ⇞Menu, ⇟Action kind of makes sense in my mind. With ABXY there's not really a natural mapping between symbol and meaning.
I consider the A B X Y labels mostly a backwards compatibility thing in case we manage to run Pandora PNDs out of the box. I would prefer it if new Pyra-specific games and ports would refer to the action buttons with unambiguous symbols ( ⇤ ⇥ ⇞ ⇟) instead of using A B X Y, which just confuses people: they are in different positions on every gaming device that has them (ABXY on Pandora, YABX on Nintendo, XBAY on X-Box, YCBZ+XA on Sega, etc), and not only that, but we also already have those exact same letters on the keyboard. For that reason, I think it's better to emphasize the unique symbol than to emphasize the backward-compatibility label.
If I would have to decide, I would use
only the symbols ⇤ ⇥ ⇞ ⇟, because why should we specifically care about backwards compatibility with Pandora but not about compatibility with Nintendo, Sega, PlayStation etc? That feels rather arbitrary -- and judging from that top-10 list of popular downloads, it looks like even the Pandora is used more for non-Pandora games than for Pandora games -- in none of the emulators in that list, it is helpful to have the Pandora-order ABXY labels on those buttons, to the contrary.
Or else I would use new symbols for the game buttons, e.g.
Π Ω Δ χ or ◼ ⬟ ▲ ✖, and then it would make sense to make those new symbols nice and big and the ⇤ ⇥ ⇞ ⇟labels less prominent -- ambiguity is avoided anyway with such symbols, though they still need the hint about the non-gaming use of the buttons.