I'm looking to make it so that ranged destruction spells will gain the same damage multiplier as fired arrows.

I'm wondering if there is any way to do this other than manually scripting to check if the player is in sneak, etc. While I am well versed with scripting and quests, I'm not sure how I'd go about doing this particular task.

bump

Supreme Magicka includes this feature. You could dig through the scripts to see how it's done.