IMO, I'll only configured the Up, Left, Down and Right buttons with my mostly used keyboard buttons. Eventually I'll try to do the moves such like in the fighting games and then get a hang of it. Used the same in other emulators as well.
Down-right, Down-left, Up-left, and Up-right buttons never configured at all.
Simple word, try to get used to it by the time you configure the move buttons. Then you will see the result by trying to move your characters. Or, if you mean by doing some Capcom fighting game moves (such as rounding 2 times or other which is as hard as that), then you better in need of Gamepad.