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Perhaps I was looking at this the wrong way. I thought you were looking for a variable which contained something like a minimum pressure value for Start / Stop to remain in effect. You're right, there are other variables which contain brake pressure values. I'm not yet entirely sure where the brakes are controlled from, but it seems like the BCM. Am I right?Brake pedal pressure is definitely detected by the system. I do not know though if that data is available over CAN or in any way accessible without electronic mods.
If the brakes are controlled by the BCM and ESS is controlled via the PCM, then yes, you're right. You should be able to put a microcontroller in front of either of those modules and have it relay data (without modification) until ESS is active. When ESS is active (and the engine is stopped), it would replace the brake pressure signal(s) with ones that indicate more pressure than it actually sees on the input.
Right now (as we're just now diving into this), it seems like a difficult task, but very much like one that's possible. Your thoughts?