Please excuse me if this makes a tasty hamburger out of your sacred cow. But As I've said before I didn't grow up playing original D&D. I did start in the hobby by playing 1E AD&D, But I have no sacred cows. I play Swords & Wizardry and Castles & Crusades because I like rules-lite and easy to tinker and customize to taste systems. I do not see my self as part of the OSR or any other sub-faction of the old school movement. I actually really like 4E D&D, I just don't feel its right for my current tastes in a games.
I really like the idea of the three saves as target numbers from 4E D&D. I don't see any reason I could not incorporate them into S&W or C&C. Or any other game for that reason. I think the one save rule of S&W is pretty genius. But Doesn't always fit in my opinion. And Having the three saves for C&C doesn't have to replace the siege or the current save system. For example dodging the effects of a trap is still a trap save. But if a giant is throwing a rock he needs to roll against your Reflexe.
Adding feats to C&C. One of the major turn offs for me about 3E D&D was feat bloat. Just too many. So I love the idea of using "talents" which are feats renamed. I like the idea of getting one at first and one additional every 3 to 5 levels. Giving a few talents to customize the character to taste.