Can somebody please edit my save file, so I can join the band and see the Studio on the map?
I didn't join the band and I am pretty far now ingame.
Probably not, sorry. This game is notoriously hard to manipulate without ruining everything.
Steam has the option to keep individual games private now. It prevents friends from being able to see playtime or the fact that you even own the game.
I was talking more about friends coming round to my house to have a video pinball session or similar though. Unless I make the games private from myself ...

(I don't have online friends on Steam as a principle, even though a friend of mine is pretty angry about that because she wants to donate games she likes, but yeah, apart from couch sessions video gaming is a private one person thing for me and it is nobodys business what I play, when I play, whether I am online - which does not mean "available" to many unfortunately - and so forth. Possibly my age showing.)