All I know is that people have played with pulling the fuse that controls the transfer case (and other things) and they have gotten the RWD behavior that they wanted but there are a lot of undesirable side effects due to other systems that have also lost power. I didn't think that the ECU was sensing the results of the TC control, but you might be right. I don't think anyone has done it for long enough to know if there is an issue like you describe with the EVO.
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