I recently bought a new Ecoride Ambassador EXT 7-vxl Spintech C2, it seems to have the same trotthle solution as the older Ecoride ambassador/City,urban( i got one), on EXT u just have to disconnect a small withe and black cable at the controllerbox, on the older one it was a black & yellow cable, then u just can gas u away and rest ur artros knees for a while.
My EXT does 27 km/h and its totally ok for me, i mostly need the throttle function when im getting up & away.
To increese the speedlimit on EXT u need to have a servicecard to log in to the menys (not impossible to get if u know a bicykeldealer:D).
On EXT there is a thumbtrottle on the left side and i must say i liked the older solution with the gashandle on the rigt side.
And when u have the sideplate at the controlbox space off its smart to seal it with silicone and also seal all the holes where the cables come in, no water in that space will make the elektronics hold mutch longer, its a big space around the cables for water to come in.