I would like it very much when ultramicxer becomes an option to disable the crossfader of the Denon MC6000. It has happened to me several times that I accedentily hit the crossfader and then ultramixer stops from auto DJ.
Sorry for the late answer.
Actually you can switch to Videocrossfader which you can find in the middle of the Controller, over the levels (only a workaround).
In future we want to include a “disable crossfader” option for all midi controller.