Or, at least, Improved Initiative.
But first, a general rule change!
"Within a given round, a creature may only use either a single standard action ability, or a single full-round action ability. regardless of which they use, they may also only use a single swift or immediate action ability in a round. If they somehow get additional actions of that type, they may use them to perform any action on the relevant table in the Actions in Combat table that does not provoke an Attack of Opportunity, due to the fact that other actions take up too much of your attention."
Without further ado, the feats:
Improved Initiative [Fighter]
Benefit: When you roll initiative, you roll initiative twice. You may act on either of the indicated initiative counts, and share actions between the two initiative counts.
Greater Initiative [Fighter]
Prerequisites: Improved Initiative, Character level 6
Benefit: You gain an additional Move action to use between your two initiative counts; you are still limited to the normal action total for a round at any given initiative count.
Superior Initiative [Fighter]
Prerequisites: Greater Initiative, Character level 12
Benefit: You gain an additional Standard action to use between your two initiative counts; you are still limited to the normal action total for a round at any given initiative count. This stacks with the benefits from Greater Initiative, and you may sacrifice the actions gained by both this feat and that one to gain an additional Full-Round action, which follows all the same rules.
So what is the benefit of the rule alterations and this feat? Well, for one thing, it nerfs a lot of action economy abuse from casters, while mundanes are far less affected.
Plus, a Fighter can sink 3 of their feats to essentially act twice in a given round, due to being uber.
In my opinion, this is the kind of thing feats should do. They should be awesome.
In addition, I also think that most special combat actions should be rewritten as Unarmed Weapons, with some classes granting proficiency and then boosting the feats to be awesome instead of minimally adequate, but that's for another time.
