Beckett
Explorer
You can enchant a Spiked Shield as a weapon or as a shield, not both. So technically, you can have a +2 Flaming Spiked Shield.
Well, yeah. My point was, a spiked shield could get a weapon enchant, so would be a weapon. A regular shield is not eligible, so doesn't count as a weapon.
The more I think about it, the more I want to get inside the player's head. He's a paladin with a shield, he should have the highest AC in the party already.