Caught Off Guard:
The title is EXTREMELY counter-intuitive. If no subject is stated, 99% of readers will assume the subject is the PC. How about "Tactical Improv" or something that fits with Razor-Sharp Chair Leg?.
Speaking of which, although not a true "chain", as RSCL requires EITHER COG OR Throw Anything, why not GROUP THEM ALL TOGETHER IN THE TABLE, so their thematic similarity is obvious to a first-time reader?
Dodge:
Is the intention of being a Swift Action that Barbarian's can't use it at the same time they are using a Rage Power?
If so, I guess it really isn't a "Barbarian Feat".
Improved Grapple:
Should Natural Weapons also qualify? If someone has Natural Weapons (say, a Sorceror),
Imp. Unarmed is otherwise 100% useless, yet still a required Feat if they want to, say, Grapple effectively. Give 'em a break!
(I actually support rolling Imp. Unarmed & Grapple together)
Trample:
Should it allow you to use your own BAB for the Overrun if better than the Mount's?
(and also allow the size/special maneuver bonus for the Mount?)
Mounted Combat Feats are so situational they need to be really good at what they do...
Two Weapon Defense:
Can you use a Shield Enchant on your Weapon on top of any Weapon Enchants?
Since you're gaining the benefit of a Light Shield, it makes a certain amount of sense...
Otherwise, +1 Shield AC with no scaling is pretty weak, especially lost-opportunity-wise (Feats),
and given it already has prerequisites (TWF, 15 Dex)
Two Weapon Fighting:
Why not just state the new penalities (-4 each/ -2 light)
instead of making the reader do extra math in their head?
(though the table in Combat Section is clear)