I'd like a configurable cross-fader as well. Mainly for use with shuffle modes and not to try and fix things that should be gapless (though it will also do that).

I use an excellent one (SqrSoft Advanced Crossfading) with Winamp for which I've set to some pretty rudimentary settings. I set it to its CLUB preset and then made some small adjustments (no fading on seek for instance, nor tracks less than 55 seconds (good number based on my other position settings)). It's worked great on anything I've played through it. Even if the two pieces of music are completely different styles and/or tempo.

Bruno