Hi Paul, I've got to head out here in a minute so just a quick overview for now:

The move factory can take 4 inputs. Input 0 is the list of objects to transform. Input 1 is the base point, Input 2 is the offset point, and input 3 is an optional boolean input for whether to drop copies or not.

The points can actually be anywhere, the base point does not have to be actually snapped on to the object, it is only the relative difference between the base point and offset point that is used.

So you'll probably want to put your base point in your case just at 0,0,0 .

Then using an offset point of 1,0,0 for example would end up transforming the objects by the difference between 0,0,0 and 1,0,0 - in this case moving it by one unit over in x.

It may be a bit tricky to detect the arrow keys while in the command, at the moment that may require a bit of coordination with the .htm UI file.

I'll take a bit closer look later on.

- Michael