Quote Originally Posted by Kholai View Post
One way around both this and the inevitable scaling issue may be to explicitly restrict non-core feats (maybe include certain books, make it an "extended core", like Bo9S, Completes, PHB II, DMG II?) as standard for the system, but then have E6C specific feats to cover the gap.
I disagree. Restricting non-core feats falls under the scope of each individual DM and his/her preferences. And let's face it; whether you choose to limit it or not, groups that want to use non-core will use it, groups that don't want to use non-core won't. Adding E6 specific feats is fine, though.