Does it annoy the living crap out of you when you start casting fire or any other spell on a mob as it then runs through you and interrupts your cast?
Well there's actually a function to prevent this called "face target" on keyboard which is the F key. It allows your character to follow the mob and face them no matter where the mob goes and will not interrupt your cast.
This is especially useful in PvP.
Now what I recommend for console players is to do the following.
Open up system configuration, go to controller settings, go to controller customization and click begin. Now move to L3 which is the left toggle with an arrow pointing down. Change this to face target and now when you engage an enemy, just click your left toggle and never have another cast interrupted!
Also do not worry about not being able to unsheathe your weapon, you can still unsheathe by holding L1 and then pressing R1.
If you didn't know any of this, I hope it helps!