Hi,
yes it is possible. If you look at the custom actions (you'll see how I communicate to the array proxy ( which is a plain scripted component). So yes you can inject data into the array or completely replace it via scripts instead of via playmaker.
custom actions for the arrayList are in "PlayMaker/Actions/Addons/ArrayMaker/ArrayList"
You'll find there all the example necessary to do your own stuff directly with the PlayMakerArrayListProxy component.
If you still difficulties with this, let me know.
Bye,
Jean