I have multiple mac computers in our home and my iPhone4s REFUSES to add anything (drag/drop) on my iMacs and I cannot figure out why. It gives me the option to sync this library but it would be overwriting everything thats currently on the phone and I do NOT want to do that. I simply would like to add an app and some ringtones off my Mac downstairs that is on this computer but I can't. How do I fix this? I just want to plug my phone in and grab a few things and go, not have to resync my phone everytime and have everything wiped/replaced. I don't see any option like I had on my iPod's to manually manage the phone, I see manually manage videos but that is it. How do I make it so I can manage my phone myself when its plugged in and NOT have to sync it? Thanks.