Jujitsudave
Mongoose
Of course I'd find tweaking magic in MRQ2 to fit S&S far, far easier than I would if I were using other systems. Happily you seem to too.
I'm with you there. The system as a whole is utterly brilliant; So much so that I don't need to change to any other ruleset, presumably ever again. My concern is with magic but like you say, the system is flexible and can be tailored to one's needs and expectations.
This is something that WotC didn't get through their heads when they made that 4E DnD system which stripped all sense of creativity from their game like they had for 3E, but that is another topic.