Keybind settings are very limited and confusing regarding movement.
For example there is no way to put crouch and prone the way I have them in every other FPS games. I use left shift for crouch (HOLD) and left ctrl for prone (TOGGLE). And when in prone I just tap ctrl again to stand up. So no need for stand up button.
In DayZ I have to use shift for both of them. (Press once for toggling crouch, press again to stand up and press and hold for prone). This is problem in fast situations when I try to crouch and start shooting enemy, suddenly Im in prone position instead.
Also DayZ keybinds are named as stance modifier etc wich is just confusing and really dont tell you what it does.
My suggestion to improve and clarify keybind settings regarding movement is to make two options for each feature: Crouch (HOLD), Crouch (TOGGLE), Prone (HOLD), Prone (TOGGLE), Sprint (HOLD), Sprint (TOGGLE) etc.. And ofcourse to keep those stance modifier buttons since some people surely like to have multiple features in same key.
This way people could set the keybinds just how they like them.
Picture for great example (Insurgensy Sandstorm):