It would be technically possible to jump to a certain region immediately but I don't know how to add this to the user interface in a way that prevents you from accidentally triggering this jump. What you have in mind are the Cue buttons in typical DJ apps, right?
I'm afraid I can't unfreeze the stop button during a crossfade. During crossfades there is lots of stuff going on behind the scenes and interrupting this is simple not possible with the audio engine I built. Therefore I lock all actions that could cause trouble during crossfades.