[3.X] Person Man's Guide to Shields

[Starbuck_II]

[*]You can use a shield as a two-handed weapon. While it’s less optimal then pretty much any other weapon due to it’s low damage, lack of reach, lack of special abilities, and requirement for Shield Bash, it can be done.

No, you can't.
Shields are offhand weapons. So 1/2 damage bonus from Str. No, buts about it.

Shield Bash Attacks
You can bash an opponent with a light shield, using it as an off-hand weapon. See Table: Weapons for the damage dealt by a shield bash. Used this way, a light shield is a martial bludgeoning weapon. For the purpose of penalties on attack rolls, treat a light shield as a light weapon. If you use your shield as a weapon, you lose its AC bonus until your next action (usually until the next round). An enhancement bonus on a shield does not improve the effectiveness of a shield bash made with it, but the shield can be made into a magic weapon in its own right.

Sucks and illogical, but thems the rules.