Just quick question with respect to targeting in combat.
Let us say I fight two mobs (a caster and a melee) with my stamblade.
I cc the caster mob (eg : Agony) and now the melee mob is aggroed and is coming towards me.
As I move while sniping (bow) on the melee mob sometimes I accidentally move my cursor towards the cc'ed mob and dmg it by mistake and hence CC is broken.
This was not the case in my previous experience (as my current casting spell/ability was locked with my target) with WoW.
Hope I am not confusing

.
Q:
Is there a way to lock my cursor onto a target unless I cancel the currently casting spell/ability actively (by pressing ESC or something) ?
Or
Are there any recommended combat addons (that kinda clearly shows the enemy target) ?