After some thought, I've decided that there's more fun to be had with Power Attack. I posted a similar feat some long time ago (I think), but I've decided that one feat that does all of this is too much. Comments appreciated.
Power Attack 2
Prerequisites: Power Attack, BAB +6
Benefit: You may choose to not use Power attack on your first attack, but then still use it on future attacks in the same full-round action. If you do not use Power Attack on your first attack in a full-round action, you may use it on successive ones, using the normal limitation (i.e. your second and future attacks this round, including attacks of opportunity, are made with the same reduction). If you have three or more attacks, you may forego using Power Attacks on any number of attacks before using it on your remaining attacks. You may not, however, use this feat to use Power Attack on an attack and then revert to attacking normally on a successive attack.
Power Attack 3
Prerequisites: Power Attack, Power Attack 2, BAB +11
Benefit: You may choose which of your attacks use Power Attack and which do not. Any of your attacks in a full-round action can use or not use Power Attack. However, any of your attacks that do use Power Attack do so at the same modifier.
Example: Samson is a 16th level fighter in combat with two demons. On his first attack against one demon, he uses Power Attack to reduce his attack bonus by 5; he succeeds in dropping the demon. After his Cleave attack on the second demon, that enemy still stands. On his second attack and third attack out of his normal sequence of attacks, he does not use Power Attack; he hits once but does not drop the foe. On his fourth attack, he chooses to use Power Attack again, but must do so at the -5 attack penalty from his previous use of Power Attack this round.
Special: If you are granted an attack of opportunity, you must use your current adjustment (i.e. if you finished your attacks with a Power Attack, the same penalty will apply to your attack of opportunity if you’re granted one before your next action).
Power Attack 4
Prerequisites: Power Attack, Power Attack 2, Power Attack 3, BAB +16
Benefit: You may choose which of your attacks use Power Attack and which do not, and you may choose the amount of penalty to apply to your attacks on an attack-by-attack basis (including any attacks of opportunity you may take).
Power Attack 2
Prerequisites: Power Attack, BAB +6
Benefit: You may choose to not use Power attack on your first attack, but then still use it on future attacks in the same full-round action. If you do not use Power Attack on your first attack in a full-round action, you may use it on successive ones, using the normal limitation (i.e. your second and future attacks this round, including attacks of opportunity, are made with the same reduction). If you have three or more attacks, you may forego using Power Attacks on any number of attacks before using it on your remaining attacks. You may not, however, use this feat to use Power Attack on an attack and then revert to attacking normally on a successive attack.
Power Attack 3
Prerequisites: Power Attack, Power Attack 2, BAB +11
Benefit: You may choose which of your attacks use Power Attack and which do not. Any of your attacks in a full-round action can use or not use Power Attack. However, any of your attacks that do use Power Attack do so at the same modifier.
Example: Samson is a 16th level fighter in combat with two demons. On his first attack against one demon, he uses Power Attack to reduce his attack bonus by 5; he succeeds in dropping the demon. After his Cleave attack on the second demon, that enemy still stands. On his second attack and third attack out of his normal sequence of attacks, he does not use Power Attack; he hits once but does not drop the foe. On his fourth attack, he chooses to use Power Attack again, but must do so at the -5 attack penalty from his previous use of Power Attack this round.
Special: If you are granted an attack of opportunity, you must use your current adjustment (i.e. if you finished your attacks with a Power Attack, the same penalty will apply to your attack of opportunity if you’re granted one before your next action).
Power Attack 4
Prerequisites: Power Attack, Power Attack 2, Power Attack 3, BAB +16
Benefit: You may choose which of your attacks use Power Attack and which do not, and you may choose the amount of penalty to apply to your attacks on an attack-by-attack basis (including any attacks of opportunity you may take).