doctorbadwolf
Heretic of The Seventh Circle
You could do something like that, of course, but to my way of thinking it just complicates the issue. Players would probably want to take some feat or other, and if you only have those on a list, why not just use the things granted by the feats on the list?
I love feats (as many gamers do) but for me what makes them so special is their rarity. Given too many of them, and they start to lose some of their appeal.
Finally, I would only offer one save for "free" (somewhere in tier 3, since that is a plausible level to reach I think but not easy) because PCs begin with two, that would give them a third. Many subclasses also give a save, making 4 not that hard to get. And of course, resilient would grant a 5th! Thus you could have a PC with 5 saves before a monk gets diamond soul! Sure, they put a lot into it, but still....
IMO, the fact they put a lot into it completely justifies it.
I can see the logic of the complication argument, however.