question

In order to get the visual of the operator Loading and Unloading with his right hand and/or left hand will require a bit of animation on your part. (Either an extensive bone animation or animate using keyframes on a legacy Operator. There are some posts here on the Answer forums that talk about animation in depth.) However, if you want to simply remove operator's travel between the conveyors, you can do this.

First open up the Operators properties. Select the "Do not travel offsets selection." Then in your exit transfer, click on the drop down for Use Transport, and select the Task Sequence Example 1 from the list. Open up the code and comment out the two travel tasks. Now you just have to set your load and unload times for the operator. And this will give you statistically the equivalent of someone picking up an item and passing it to his left side.

The visual will look choppy, again if you want to animate this, you will have to animate it yourself.

Alternatively, you can leave the travel tasks in, but set the load time to 0 instead. (Still keeping the No offset travel option) And this looks slightly smoother, but now it's the travel time of the operator between the two conveyors represents the length of time the item spends in the Operator's hands, not the load/unload time.

I've included both ways as examples.