Prestidigitalis
First Post
The "add layer" method could even shake the base foundation of 4e. While it might mean extra work and maybe not worthwile (I'm just brainstorming), you could design the game by layers. So you could have role and powersource layers (ie: you put "defender" layer on top of "martial" layer, and you get a different effect than if you put "defender" layer on top of "divine" layer). Dunno if it would work, but sounds intriguing
I like the concept too. It's also a way to allow an extra power-up for campaigns where it's appropriate, without the clunkiness of the gestalt concept.