Capture planets and integrate population

I have never been a fan of nuclear bombardment of a planets surfsce. Os it possible thst we might get an option to land marines using troop ships and have a sort of land battle screen?

otherwise can we also have a way for the surrender of a planet by a player after his or her main buildings have been surgically struck from orbit. A player may then surrender the planet in anticipation of getting it back while then benifitting the attacker who does not need to rebuild the infrastructure.