StreamOfTheSky
Adventurer
Well, if you were to make such a feat, first off there's the issue that it should NOT actually increase BAB, only "effective BAB," both to match PS and for balance reasons. The other poitn I forgot is yes, every level you gain BAB, or a fraction of it. Even as a wizard, in 4 levels you gain +2, while as a wizard that goes 4 levels into fighter would gain no CL at all from the 4 levels. So such a feat would be an effective +2 to BAB, to counteract taking 4 levels in even the least melee-focused of classes.
It would apply to meeting pre-reqs, not sure if anything else. I think allowing it to hasten when you get the next iterative attack is too powerful, and would compare it to how PS doesn't hasten when you gain access ot new spell levels. I still think such a feat is a terrible idea, but that'd be how I'd do it. +2 effective BAB, up to your HD.
It would apply to meeting pre-reqs, not sure if anything else. I think allowing it to hasten when you get the next iterative attack is too powerful, and would compare it to how PS doesn't hasten when you gain access ot new spell levels. I still think such a feat is a terrible idea, but that'd be how I'd do it. +2 effective BAB, up to your HD.