
harmor |

Instant Reflexes (Combat)
Your have split-second reflexes.
Prerequisites: Combat Reflexes
Benefit: You may take one additional immediate action per round. With this feat, you may also make an immediate action while flat-footed.
Normal: A character without this feat can make one immediate action per round and can't use an immediate action while flat-footed.
Special: The Instant Reflexes feat allows you to still take your swift action on your turn if you only used one immediate action.

Remco Sommeling |

Not a fan of this feat, it messes with an important limitation on action economy, and will likely have more impact than a feat should have.
If you want to implement a similar echanic best be specific which kind of immediate actions you have in mind to use his feat with and build around that, much easier to balance that way.