Station's

[lalelulilo]

I think that you should be able to build multiple stations in a sector, and each one should work as a different stack, same for mining facilities, no station stats are shared (all have separate cloaking etc etc) but mining facilities take on the cloak of the highest, this would also allow for alliances to build many station's in one sector (maybe capped at 10 stations, 7 mining facility's, and 5 separate planets), this would also bring into play new research such as system co-ordination (allows construction of more than one station in a single sector, up to 10 per sector), Mega-complex (morphs multiple stations/mining facilities into one, the base stat of this megaplex would be the stations combined base times 1.5, the mining facilities would have a 10% boost to income for each facility, and the max upgrades would be the total amount of stations/mining facility the megaplex times by your research.

[Killer07]

I think its a good idea,but on the other hand if all the top players joined an alliance they could stack loads os stations and be impossible to attack

[AFB]

Yep, its hard enough to take them out one by one, together they will be invulnerable. And top players on wars anyways are mostly from one alliance- AI