View source for Publication:Unearthed Arcana/Weapon Group Feats

===Weapon-Specific Feats===

A DM who uses this variant can rule that any feat that requires a character to choose a specific weapon to apply the feat’s benefit to (such as [[Improved Critical]], [[Weapon Focus]], or [[Weapon Specialization]]) can instead be applied to a weapon group. The character must still meet the prerequisites for the feat.

Though this variant seems to grant a large benefit to the character, it really doesn’t significantly improve the character’s power level. Since a typical character only wields one weapon at a time (or two, with a different weapon in each hand), the character doesn’t really become any more powerful in a typical fight.

It does mean that a character is more likely to benefit when new magic weapons are found, since he’s more likely to be skilled in their use. That can actually be beneficial to a campaign, in that it allows the DM to include a wider range of interesting treasures that the characters actually use (rather than simply sell or trade).