I'll add what I ended up doing here as well in case late on someone comes across this search.
Typical of drive by wire systems there was terrible lag in the first part of the throttle travel. So I bought this Wind booster C8 throttle controller by Cammus. #EYC124A. Its only the size of a matchbox.
To install it you only need to unplug the harness from the top of the throttle pedal assembly. Press the tab on the plug to release it.
Then take the original plug and fit it to the throttle controller harness. The other end just goes where you took the original plug out of the throttle assembly.
I mounted it between the steering column and the centre part of the dash, (RHD). The wire I just pushed in between the two panels.
Can see the wire come out on the far left and then run in behind the alloy column mount.
Then zip tied along the existing harness keeping away from the rotating steering shaft.
The left button is the mode one where it has 4 options. Off, ECO, C1 and C2. ECO is slower than stock for low range in rocky terrain for instance. C1 and C2 are both faster. Each of these modes have 10 settings, adjust up and down via the two right buttons, to give 30 variations of throttle response. I found C1 level 5 the best. It has really made it feel alive and you would have thought it has had a power boost! That dead pedal feeling is all gone.
