[Q]

More abilities for systems:
1.) Maximum speed: no ship can go faster than x sectors per turn.
2.) No stellar manipulation possible (like the effect of a system gravitational shield): no warp points open/close, no star destruction.
3.) Positive/negative influence on happiness and reproduction for all colonies in the system.
4.) Selective non-function of certain weapon types (e.g. missiles, torpedos, beams) in the system.
5.) No effect of all training/racial combat bonus for ships in the system.