Three key premises for this question.
1. A Barbarian's rage gives morale bonuses to Strength, Constitution, and Will saves.
2. A Courageous weapon increases any morale bonus the wielder receives by half its enhancement bonus.
3. A Furious weapon increases its enhancement bonus by +2 when the wielder is raging.
My question is, do temporary increases to a weapon's enhancement bonus count for Courageous? If a Barbarian wields, for example, a +4 Furious Courageous weapon, does he get +3 Str, Con, and Will over his normal rage, or only +2?