I don't see why people ask for multiplayer when it already exists. Two or more users can pass save files around, each sending something up on each turn. Macey Dean's "Battle for Laythe" is a good example of this. Really the only thing needed for KSP multiplayer is some friends. Plus if you there was real time multiplayer the forums would be clogged with crap like: "this guy sed a bad wurd wen i wus playing multiplayer plz ban him"