Is your feature request related to a problem? Please describe.
Not really. It's just an improvement, not a solution to a problem...

Describe the solution you'd like
When using Cantata I have an option to "Stop after a specific tracker" (there's even a system tray menu option which allows to either just "Stop" or "Stop after current track"). That's excellent because I use a little script that is always feeding the playlist with new tracks, and sometimes I just want to add a whole album and stop after its last song (as the script runs in background it's always adding some track or other to the end of the playlist and, as a result, it would playing it non stop). It would be amazing if ncmpcpp had such a feature.

Describe alternatives you've considered

Additional context