CHANGES Proximity to other owned sov. So if you own a system and your other sov is not connected to that system then the cost is increased of the unconnected system.
The aforementioned criteria could also be modifiers for effecting Sov structure tenacity. So a lightly or unused system would have structures with shorter RF cycles and less EHP. As system lose or gain tenacity the resist are modified on the sov structures. So a completely unused system with Sov would have 0% resist on the sov structures. Where conversely a well utilized system with sov would have 80% ( debateable) resistance to its sov structures. This tenacity would make it much harder to kill the sov structures.
Stations are destructible. You wreck/kill the station all assets are relocated like a clone to a lowsec location. Perhaps it leaves a wreck that can be rebuilt who knows who cares we all want this lets do it and be done with it.
Once a party conquers a station they have the option to put it into the destruction RF cycle. The station enters a 7day RF cycle where during this cycle anyone can come and repair the stations (Structure?) to a certain level cancelling the destruction cycle. Once the destruction cycle is aborted if cannot be started again till the station has been reconquered.
Ihubs & Station & POS become hackable. Meaning that a player can hack the ihub and disable a upgrade for X period of time ( 8 hours?) . When a player initiates a hack it emotes in local with a countdown and a notification is sent to the alliance via evemail that someone is attempting a hack. If that player isn't interrupted in a period of time (15 mins?) then the targeted upgrade is disabled.
Hackable things would be , Cloning , Repair , Factory , Refining , Fitting , Moon Harvesters , Reactors , Refineries , Pirate upgrades , Mining upgrades , Cyno Beacon , Jumpbridge , Cyno Jammer.
Asteroids are rebalanced so that lower tier roids produce some abc and higher tier roids produce lower tier mins. That way as nullsec miners mine the ABC's they are getting the trit and Pyerite etcetera that they need to realistically produce.
Deathclone changes to only closest station with dockable access or players birth system.
*Adjacent is defined by gate connection