@fallen one:
That'd be "Ply's Mod".
[EDIT]
I was going to say that this isn't possible at all, even with Ply's Mod, but with a second though it may be.
Here's what I'm thinking:
1) Make an invisible entity with no collision that will be positioned at the player's feet all the time.
2) Have this entity target the enemies that you're looking for.
3) Once the target is set, have your invis entity rotate to their target.
4) Now, set the player's rotation angles to match the angles of the invisible entity.
TADA!!!
It would take a bit of work, but I'd say it's entirely possible.
[/EDIT]
The one and only,
Whosoever says, "Don't sweat the small stuff," is obviously not a programmer.