I did have a working solution, but it need's addons. The MPx PAS solution needs a throttle as the PAS only enables the Throttle to engage.
One possibility is to use the PAS not with the MPx but with an external Logic to do a Frequency-to-Voltage conversion. It's simple "more Pulses from the PAS gets more Voltage" which supplies the Throttle in.
With an more intelligent PAS sensor it could even be used for back pedal brake detection (=> recuperation). The circuit is much simpler than it may sound duie to the pure analog regulation.
My MP3 is using the default MPx circuit and the MP3 is quite hard to regulate with it, just as promised. To get rid of the thumb controller I needed to put the 5V Throttle In after a 2sec wait when it's powered on (due to a wrong input detection control). I planned to use a simple "high pass filter" but it needed one additional wire, so I stayed with a simple on/off switch, which I had to manually switch to start riding; the regulation is quite crude. When my MP3 failed just after a few hours I planned to switch to the MP2-Ext. Controller config, but didn't have time for a complete redesign. There are a lot of ext Controllers better fitting the EU regulation and easier to upgrade when more modern (Sinewave, three line bridges or inline regulation Bluetooth) functions are available.