All of these functions disable some part of the user interface, thus restricting the players actions.
[no fix] DisablePlayerControls
Player can only look around with mouse or use options menu, nothing else and menus disappear.
[no fix] DisablePlayerFighting
[no fix] DisablePlayerMagic
These two functions seem to be unreliable according to forum information: If the player holds a weapon or has a spell readied he can continue to use it and quick-keys for weapons and spell likewise still seem to work. I currently don't know of a reliable solution for this problem.