I was kicking around a modern day Sherlock Holmes skill set up (thanks to the BBC series, Sherlock) and thought about his ability to read people. It's covered by Empathy, normally, but for Holmes it is clearly more of a feat of Investigation (or arguably Awareness, given how instantaneous it is for him but that's another topic entirely). Now that's an easy enough solution, make a stunt to give the Reading People trapping of Empathy to Investigation. Now what if I want to apply a stunt like Read the Surface to the Investigation based additional trapping making the inspection require 1 minute of interaction instead of 10?

The book doesn't really go into it but I'm sure it's just a matter of not thinking to take the rules that far. So would you allow it in your game: Two stunts to provide an enhanced, additional trapping to a skill?

Basically, I have two people who want to have Evocation as part of their power set. Problem is, one is worried that since he's a wizard and magic is his bread and butter, he'll get outshined and become the thaumaturgy guy. I personally don't think it will be an issue since Evocation is pretty much a combat only thing, but that argument isn't making my player feel at ease (and we haven't actually played so I have no idea if that's even a valid argument). I don't want to play favorites, or make both of them trash their characters completely, and I can't think of anything to tell them to make them get over it. Any suggestions, oh wise ones?