Feat: Chain Fighter

Requires: Proficiency with Spiked Chain

Benefit:  As a Swift Action, you can swith between using a chain as a reach weapon and using it as a double weapon.  When the chain is used as a double weapon, it has the following changes:

Reach: 5' (melee)

Damage: 2d4/2d4

The off-hand attack is considered to be made with a light weapon for the purposes of determining AB penalty.

Thoughts?

*When the chain is being used as a double weapon, it has the...*

My only addendum

Edits made...please re-eval