The limited controls are part of the game experience, it wouldn't be as scary if the player had that much freedom and some of the scares wouldn't work.
I've been playing 3d shooter games on the pc for many years
Like since 1997
I have game Ideas and would never put that limited type of control in
ya I know it takes a bit to get use to
but I think are limiting what folks would
be able to work with by having it the way it is now
I remember in Duke Nukem 3d
there was the option in the game to give the player
the choice to chose which way they wanted to have the controls
so my thought to you is put that in your program and
let the player chose which one they want to use