Does this add new inserters?

No. Berbcorp Inserter Control modifies compatible existing inserter prototypes so their pickup/drop vectors can be adjusted.

Does this run every tick?

No. Berbcorp Inserter Control has no tick handler. It only runs when the inserter GUI is opened or when you click one of its controls.

Does this render world grid markers?

No. The GUI is attached beside the normal inserter window and does not create rendering objects in the world.

How do pickup and drop selection work?

Left click on the main grid sets the green pickup tile. Right click sets the red drop tile.

What are the offset grids for?

The pickup and drop offset grids choose the exact point inside the selected tile. This is useful for belt-side placement, near/far belt lanes, and fine inserter targeting.

Is this safe for existing saves?

Yes. You can add it to existing saves. If you remove it later, inserters that were already adjusted keep their current positions.

Does this affect achievements?

Like any modded Factorio save, it uses the modded achievement set.

Does this require Space Age?

No. It targets Factorio 2.0 and works without requiring Space Age.

Why does it conflict with other adjustable inserter control mods?

Those mods control the same pickup/drop vector fields. Conflicting avoids duplicate controls and unpredictable interactions.