Unless a feat specifically says it can be taken multiple times, it can't.
I know, what I didn't was Endure Blows lacked the same cause Roll with it did. Improved Damage Reduction and Thick Skin stack just fine as well. And speaking of;
And let's not get into the issue of it being "unupdated" because the update has a different name. It is very clearly the same effect done exactly the same way.
So, you're saying the Monsterous Dragon-Only nonstacking Endure Blows is a clearly a 3.5 update to the General Roll with it that provides a stacking Bonus without a single rules quote?
What, am I to believe the infinitely stacking Warforged-Only Improved Damage Reduction Feat is a
clear update to the Monstrous stacks-only-to-double-the-original-value Thick Skin as well?
Edit: Oh wait, forgot Damage Reduction. A 3.0 Epic Feat that provides a stacking +3/- bonus that made it into the 3.5 SRD. Boy I wondered what you think that was updated to...