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Though a little cryptic, applying a similar logic, the heavy shield is still a one-handed weapon, regardless of what traits/feats you posses: "Things that talk to its construction and physical properties are treated that way." If STR damage for two hands is based on the weapons construction, then using two hands would apply extra damage.
The only caveat I see is if a character doesn't have training with martial weapons, would you be subject to a non-proficiency penalty? Or put another way, do you have to be able to use the shield as a martial weapon to avoid a improvised weapon penalty when using two hands?
By that ruling - when you have this trait a heavy spiked shield would become the 2nd weapon which you could TWF with it only and get dex to damage so WF etc would apply to both weapons. (though not with both weapons like sawtoothed sabres)
I'm not saying that I disagree, I'm just pointing it out.
Edited: my wording was horrible
What?