Presets without duration und skipping

Questions
1

Hi, i would like to control my playlist via MQTT with flexible times. Is there any way …

  1. to create playlist with infinitive duration for the presets ? I do not want to give a fixed duration since i would like to skip with MQTT
  2. to skip the playlist randomly to the next preset ? It seems that i can do it with just the selection the playlist again, but i think i read somewhere about a special command to skip to the next entry.

thanks,
Tom