Hmm hopefully a Google search will reveal something, a custom kernel/rom should take care of some of the issues inherent with the stock setup if there is enough support for it, xda developer forums is a good place to go for that. I had a old phone that was terrible with battery life due to how it handled the radios until i found a rom with a fix for it. And i actually just switched kernels due to a issue that kept my phone awake and screen sucking battery life even with it off. You could try a macro/task to turn off the cell radios but airplane mode should have done this.
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I'm going to look at this from another angle. I posted something in the fabrication section but I want to try a physical mechanism to turn it on and off.