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A couple of things:
First, from what I've read, your tire pressure should vary ~ 1 psi for every 10 degrees of temperature. In reference to one of California98Civic's earlier posts, I neutral coast about 5 mph faster down a particular hill with just a 30-40 degree temperature shift (so roughly 3-4 psi).
Second, I have a TPMS installed, and I have not noticed any issues with going over pressure. My stock tires had a max sidewall of 42 psi, and my current tires have a max sidewall of 51 psi. I'm running at max (morning inflation), and I have not had the system kick anything back, even at > 10 psi over what the sensors are calibrated for. One caveat with that, though, is that each manufacturer tends to use their own tire pressure system, so this might not be universal.
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