I would like to see the Crossfade manual changes slider scale extended beyond 100%, to possibly 200% or 400%.
I often find my playlist (or perhaps myself) in a state where I want to preserve a certain mood. With no pause, a quick crossfade between most tracks time works, most of the time. But then along comes a track I find I want to skip and suddenly the crossfade is too short for a manual change resulting in an abrupt change worse than the actual "offending" track. Making manual changes actually longer than normal crossfades would - I think - soften the effect.