And a small note: as you said, the tractor beam is typically used to move roids (Ore and Silicon Mines) around big/huge complexes, but also bear in mind that using tractor beam may unintentionally alters the orientation of the target station, I'd use the tractor beam only when so neccessary. imo better build the station/complex at the right location from the first time so as not to waste time relocating stations later.
