Hi @firecap65! Welcome and thanks for posting to community.
It's not currently possible to replay tracks, create new playlists, or transition to an autoplay playlist directly from the Sonos app.
However, you can do all of that and control your Sonos device directly from the Pandora app. Though, since ad-supported Pandora and Pandora Plus are bound by our existing license to stream some of our tracks in a radio format, a replay option may not always be available. These types of tracks will either have the replay button grayed out, or you will receive a message saying, "Sorry, this track cannot be replayed" upon attempting to replay the song.
While replay is not currently a feature in the Sonos app, the best way to get ideas like this heard is by submitting a feature request on the Pandora Community. There you can search and vote for current feature requests, or submit a new one.