If you can use a what you know in DnD, how about being able to do the same in Shadowrun?
Knowledge is Power
Cost: 5 karma
You know how to walk the walk, but more important, how to talk the talk. So much so the silver-tongued devil that you are is almost as impressive as how book smart you are. When you make a Charisma roll with any skill in the influence skill group, you may add your ranks in a relevant knowledge skill to the dice pool. You must be invoking the knowledge to gain these bonus dice. You can not gain these extra dice on a roll where you do not mention the skill.