I was wondering where in the CK you could see the information for sneak attacks.

For example, where could you change the base bonus to damage for just a regular sneak attack?

Thanks.

Not sure but an easy work around would be to add a perk to the player that is invisible and does nothing but increase/decrease sneak attack damage with a priority of 0

Effectively, it would do the same thing - change the "base value" of sneak attacks, with the perks in-game you can get adding onto that value.