It just now acured to me, weapon focus was also a thing, in just about every DnD game I can think of. In NWN and IWD You would basically focus on a certain weapon like a scimitar for example and you would get a +1 to attacks with that weapon and I think you could do it 3 times to the same weapon, 3rd being mastery. Old BG was up to 5 if you were a fighter but honestly 3 would be enough.
But when you really think about it, if they added all the missing feats, you would need a feat for every two levels for it to be worth while and just keep the powerful ones at certain levels as they are now, things like ability +2 or even +1, just to keep you from being overpowered but would also require enemies to be updated with feats as well.
