Yes, throttle action is easier/smoother or technically, a more positive reaction either way.
Still, please click HERE. This is how the dual cables are positioned to the throttle grip. On accelerating, the pull cable is pulled at the same time, the push cable is pushed back. There would be a reaction on the other cable even if only 1 cable is pulled or pushed.
A secondary throttle not only must work similarly; i.e. pull and push, it also must be able to turn the original throttle grip since there is nowhere the cables can go.
A potential workaround that can be explored would be to remove the push/return cable and operate the system with only a pull cable.
It may be necessary to stiffen the return spring.
And to replace the pull cable with a split accelerator cable intended for 2-stroke engines. Click HERE.
Originally, this split cable allows the throttle grip to pull at the same time the carb slide and an oil valve.
A potential reversal of application maybe tried; i.e. two (2) accelerator mechanism to a single pull cable:
- the original throttle grip; and
- an add-on accelerator lever similar to those used by ATVs. Click HERE.