I have tried to tweak the favored enemy ability a number of differant ways. I have settled, so far, with dropping the evil alignment restriction for having your own race as a favored enemy. I have increased the starting bonus from +1 to +2, so that a 20th level ranger has 5 favored enemies, with bonuses of +6, +5, +4, +3, and +2. I did not change the damage bonus so that it would affect undead, constructs, etc. Rather, the ranger always has the option of choosing the defensive favored enemy path, or he can take the feat Supernatural Blow, which allows the normal damage to apply.