I infer the crossfading currently works like this:
Take the user-configured crossfade duration, halve it, and count that many seconds back from the end of Track A to find the point at which crossfading should commence.

Instead of beginning the count-back from the end of the track, I propose the count-back begin from the point approaching the end of the track where the level falls below a user-configured level.

This would elminiate situations where tracks that fade out over an extended period result in no discernible crossfading during the transition to the next track.

The sqrsoft plug-in (http://www.sqrsoft.com.ar/en/index.html) for Winamp is an example of a cross-fader that can do this.