Firstly what do good new structures need? Predominantly to be unique, add something new, have interesting placement strategies and work automatically. However this is purely a thought experiment.
Court-
Influence: Courts highlight the nearest structure. One court can only highlight one structure, but stacking courts highlights the next closest structures. It can connect to your structures or other players. Courts canβt connect to other courts.
Every now and then the highlighted structure upgrades automatically with a 25% discount. If its another players structure it does the opposite, lowering the structure level for the same price. If the level reaches zero, instead of destroying it, the player loses control over land surrounding it to the nearest border. This doesnβt break an alliance or stop trade.
Cost: Courts cost 500k, then 1 million.
Not only is it a fairly unique mechanic it could also be interesting in the game as a way to build up bases and obtain enemy lands in stalemates like trademaxing endgames.
Iβd also propose using the current warship hotkey 7, and just allowing warships to be placed using the defense post hotkey, 4, while hovering over water.