Not sure if this project is still alive but hope someone can add this feature =)
Wish cplay would automatically save the position where you left off when you exit (per playlist) and resume when you open that playlist again.
This is mainly for long audiobooks/podcast.
I found a commandline script to do this but I like the cplay ncurses interface better.
This is the current script i found that has resuming for mplayer m3u playlist.
Maybe you can use the existing code and add that to cplay.
https://github.com/pts/mplaylist/blob/master/mplaylist
Thanks