Welcome Nerual - it's a pleasure to meet you in this fine thread.
On-topic, thing is... You can kick to interrupt a spell, yes - but what about that nice combo you've got going? As your Perception skill gets better you'll know what spells your opponent is casting - so, if you see this giant fireball about to be thrown, you might plant a boot right in the cocky little kisser of a mage, but if it's just a humble icebolt, you might as well just finish your chain of attacks and hurt him big-time!