Well, this would be your game, you're its GM. If you want a system, feel free to use such. I'd advice against it due to not having said this would be a system game in your interest check. Or you can do what you suggested and take a light system for certain things or certain areas but not impose it upon the whole of the game.<br/><br/>Personally, I never use any system and keep to freeform always. I trust my gamers/ co-writers to not abuse any form of power (godmod or metagame).<br/><br/>I do understand, though, that certain types of games need a system.