I quite literally registered just to post a bit of info on the subject here.
Most drivers for the DualShock 3 and/or 4 are based on the "ScpService". The creator of that didn't update it in a long while (the original thread for that is in the PCSX2 forums), so many people went from it and did their own things, such as DS4Windows for example. I'm personally using ScpToolkit by Nefarius mainly for its support of both DualShock 3 and 4 but also for its GUI, and lack of ads, but that's beside the point.
The point here being that all of them are effectively emulating the DualShock 3/4 as an Xbox 360 controller. In other words, you're using a DS3/4 but the Operating System sees it as an X360 controller, which naturally means all the programs do that as well. The main advantage of this is the compatibility that the aforementioned gamepad has on the Windows platform. The disadvantage... well, XInput is sometimes weird. Anyway, if the driver is done properly then the button mapping is exactly the same as on the x360 side, so copying the placement from that texture is all that's needed. I did that personally, in case someone wants to try that out, here it is (all credit goes to the relevant parties, I did only small "copy, paste, resize, position" job):
Those with sharp eyes may notice, that there are no "L2" and "R2" buttons there, and that's because you can't map them with the XInput in either FFVII or FFVIII in their Steam variants. Those particular buttons are not only analogue but also mapped on a single axis, which creates its own issues for the lazier implementations of the support for gamepads. That's why I replaced those with "L3" and "R3", which for those that are familiar with Playstation button schemes are nothing more than pressing the corresponding analog sticks.
I hope this small piece of info will result in a more "plug and play" experience for those that want those Playstation button prompts. Maybe also will benefit the next versions of this mod as well, who knows