Remove or deconstruct a large ammount of buildings, defenses or mines.

Hi there!

Can you select all your defenses in a system and destroy them somehow?

I'm a defensive player and move forward planet by planet, leaving behind massive minefields and system defenses, these all have hundreds of thousands up to several million in worth of resources all together and I think they may be making the game lag slightly.

So now I wish to clear them all away and "civilize" these systems.

However, when I select a large amount of objects (mines for example) and press the destroy or "shift-s" button, only one is destroyed.

As I do not wish to go through some fifty star systems and destroying each building by itself, I'm asking if anyone knows a better way? I've probably overlooked something really simple.

All help is appreciated!