When synchronizing Playlists between iTunes and an iPhone, by default, the playlists of iTunes are preferred - even if the iPhone's change is more current. I prefer to change my playlists on the go on my iPhone, so I want to change this behaviour. Is that possible?
I'm unaware of any settings that this will work with iTunes/iPhone out of the box. But you could give iGadget X a try:
PS: It's shareware ($19.99)