Cool that your making changes to the AI.
I am sure StarFire can answer you more on the sensor, but I can answer the last .ark part.
The Orc is stored in the .ark package, but there is no script in the ark, just a mesh, Skeleton, materials and textures.
The script is apart of the preset stored in the preset folder.
You can change the script and just save another preset file of the ork.
Simply open the asset manager, goto a folder anywhere, then drag from the scene entity list to the asset manager view.
This will create a preset of that entity.
There is also a button in the asset manager toolbar for preset import.
Or right click in the scene and choose save as preset.
Then drag or spawn your version.
The current ork preset will be in the "Presets/Skyline game system/fps kit" or something around that structure.

