I noticed that opposed to the official releases, this version of Project Diva doesn't recognize the arrow keys (Regularly played as WASD) as face buttons (UHJK). I was unable to find a way to do this, so is there a way we can get multiple configurations in the game? So that when in game, those buttons are recognized as the same?

First of all, this is not a Project DIVA, it's standalone game, which is became somewhat similar to Project DIVA eventually. First "maps" for PPD were created in 10-keys style (arrows, circle, cross, square, triangle, L,R), so those are all different buttons, they work apart from each other (for example, right arrow and circle is not the same and this is absolitely normal).

As for your question, i think i saw several threads before with same "problem", users suggested to use some program to do that.