Here’s a quick sneak peek at the playlist feature in V3:
The sequencer UX is refined, and a new playlist option is added. You can add patterns and set how long they should run for. Drag and drop to reorder. It even shows you progress for the time remaining 
It works with the button too! You can set a pattern to run for a really long time to effectively stop at any point, waiting for some external event to proceed to the next item in the list.