This application allows you to play listed SUB file(s) in order, including the option to repeat!

Documentation (by darmiel)
Application source (by darmiel)

A compiled FAP file is included in Unleashed (original source) and RogueMaster under Applications -> Tools -> Sub-GHz Playlist

NOTE: The folder on the SD card has been updated to subplaylist instead of just playlist as seen in the documentation above.