I'm not a big fan of power attack feat currently. My main issue is that much of the use it had in 3e has been eliminated (dealing with DR, sundering, attacking low AC targets). Further, attack bonuses mean so a lot more now, because attacks often carry rider status effects upon them.
Still, I think the idea of power attack is a good one, but the attack penalty is just generally too harsh. So here's my idea:
Power Attack
Prereq: Str 15+
Benefit: You can use power attack once per encounter as a free action. If your next melee attack hits, it does extra damage given by the table below.
1-10th
+2 (+3 THW)
11-20
+4 (+6)
21-30
+6 (+9)
So while power attack can be used much less frequently it is a straight up bonus to your damage.
Still, I think the idea of power attack is a good one, but the attack penalty is just generally too harsh. So here's my idea:
Power Attack
Prereq: Str 15+
Benefit: You can use power attack once per encounter as a free action. If your next melee attack hits, it does extra damage given by the table below.
1-10th
+2 (+3 THW)
11-20
+4 (+6)
21-30
+6 (+9)
So while power attack can be used much less frequently it is a straight up bonus to your damage.