I'm working on a scratch build that has an inverted exaggerated gull wing and was thinking about adding vertical stabilizers that are canted (tilted) inward. The stabilizer will have rudders attached to the last 1/4th or 1/8th. My question is, how much does this affect the flight performance in regard to pitch while using rudder control? If I stay within a certain limit (say 30 degrees) am I safe and won't really need to add mixing with the elevator? I know the F-22 and F-18 are canted outward to get into "cleaner" air during higher alpha values as well as stealth characteristics. Since those planes need computer assistance I'm assuming they also mix elevator control when using the rudders. Is this true? If so I'll most likely need to mix it for more accurate flight on my scratch build??

Thanks!
Azeiku