Before Ford/Edsel, it was Packard that had an electric pushbutton automatic trans shifter mechanism. They had their problems, too! Basically not changing when "P" was pushed.
The Dallas (TX) HIstorical Soc. has a car blog/bulletin board section. Subjects usually center on cars people have owned and related stories, plus the various dealerships in Dallas in the 50s and later.
One Packard story related that the mother and son pulled up in to the front door of the local A&P grocery store. As was a somewhat common practice back then, after she pushed the "P" button, she revved the motor a bit (for better charging of the battery?). As the trans wasn't yet in "P", the car accelerated through the front doors, continued to the rear of the store and the butcher's meat area. The son said she calmly put the car in "R" and went out the same way she came in. Once parked, everybody came out of hiding to see if she and the son were ok. The son said the store manager called his father and requested he come to the store, and to bring his insurance agent. That was a '55 era Packard they were in.
Chrysler went with a cable for their pushbutton shift. Edsel wanted a more upscale approach and went "electric", probably knowing the issues the Packards had had.
I remember seeing a JCWhitney "conversion" to a floor shirt for the automatic trans, in the '60s. There must have been a similar kit for the Packards as I saw one with a floor shift a while back.
CBODY67