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I don't think you generally want to reduce "normal" levels of disc brake drag for the aforementioned increase in pedal travel. I don't think that normal drag results in any appreciable temperature benefit on street cars.
Another thing that can cause binding brakes is an internal failure of the flexible portion of the brake line. An internal separation can cause a flap of rubber to retain fluid at the caliper and prevent it from knocking back. I see the OP's car isn't that old, so this shouldn't be an issue.
MazdaMatt: the SRT8 Challenger utilized a patented algorithm where the ABS/EBD system "pumped up" the brakes to compensate for high-g cornering induced knock back, preventing the double-pump problem in hard driving.
DonR: a similar spring could be used but only on pin slide floating calipers. Without knowing the particulars of the poster's car it's hard to say if this would work, but it might. It might also require a double-pump or increased pedal travel. I've worked on vehicles that had non-pin floating calipers and it would be hard to make such a spreader spring work, and with twin-piston (opposing pistons, one each side of the rotor) calipers I don't think it could be done.
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