Holy cow...! I've been thinking about semi-automatic TTs now, and there you have it, Panasonic invented it twenty or more years ago. In the last few years, Panasonic made TTs with a "soakmatic" feature that let you pre-set a soak time, during which the impeller would rotate a couple of turns every 10 -15 minutes to give the detergent and water a bit of movement.
I'd be interested to see interior pics, closeups of the controls, and decent scans of the user manual.
BTW, if you ever consider selling that one, let me know.