Thanks for the tip, I will try it, but it is not easy at all.
Having to hold a "walk button" to crouch walk would be bad. It should not be necessary.
Just pressing the movement directions should already be enough when going to crouch position.
This frees up one more finger from having to press a key.
During an emergency it makes more sense for the player to press the crouch button again to stand up and then simply run in whatever direction it wants... it makes more sense that way too: have to stand up first to be able to run.