47 can already do this. Very potent move.
This is a gimmick from WOLFENSTEIN 2: THE NEW COLOSSUS. I am not sure it is worth stealing.
It is sort of possible right now to press against a wall and crouch to allow enemies to walk right past 47 without noticing him as compared to 47 pressed against the wall while standing.
What would be cool and in keeping with 47’s style is that he can do this if hanging from a wall indentation and then slide all the way down the wall and straightening his tie after the landing.