Actually, I have another idea for a feat, which could be limited for fighting classes only, to give them an additional edge and help them within their area of expertise.
http://nwn.wikia.com/wiki/Great_strengthIt is an epic feat, accessible after level 21, but I think there wouldn't be a problem with altering the requirements. The proper requirements are the question worth discussing - strength is an useful attribute, so characters, perhaps, shouldn't get it too early. I suggest to set the requirements for 10 levels of either fighter or barbarian. Another requirement might be disputable: maybe, force the characters to already possess some capabilities beforehand to have the chance of improving through the feat - that means, 14-15 strength.
I realize that we already have five points of attributes to spend through the character's development, but an additional point on a fixed attribute might open additional build routes, and as mentioned before, further improve the usefulness of fighters, without making anything game-breaking.