There are so many days that I rage in anger at the difficulty of getting the older FEHs to move into EV mode. It is truly a challenge to my patients, especially on cold days. On warm days it is fairly predictable and much more easily achieved ... but it is still more work than it should be. It seems that this wasn't truly addressed until the '09 model, where it does act like it should, going into EV mode simply by letting up on the accelerator anywhere under 40 mph. I have often wondered if something similar to your "yuppie button" would provide the signal to go EV under 40 mph, but I am not technically skilled enough to give that a try It would be manna from heaven though.