Try to think of a way to make FPS playable without analog sticks assuming you're using a controller like the PS1 controller before it had the analog sticks and became the first dualshock.
In case you don't know, a PS1 controller has a: 4 way d-pad , 4 buttons, + Shoulder buttons, R1,R2,L1,L2.
Start + select
In case you don't know, a PS1 controller has a: 4 way d-pad , 4 buttons, + Shoulder buttons, R1,R2,L1,L2.
Start + select