I've thought about this before, while a simple manual crossfade would be nice in MC, for it to be good and not a mediocre feature, it would need to be more than a simple cross fade possibly allowing hardware to control the crossfade, multiple decks within 1 zone would be essential.. For this I don't think the buck lies with J River, I just wish software like Native Instruments Traktor could support DLNA views, then I could have all the lovely view schemes of Gizmo, directly within an application that is much more suited for that purpose..