I have tried to report the bug that MOD files are looping instead of stopping when they finish, and a few people have told me that this is not a bug, as though MOD files are supposed to loop endlessly. I do not understand why anyone would believe that MOD files should loop. Of course, people who want their MOD files to loop should have that option, just as that option is already available for MP3s and other audio files. But those who don't should have the option to not have MOD files loop back to the beginning when they finish. In the context of a video game, it may make sense for a MOD file to loop, because the game will give its own signals for when to stop playing one MOD and to play another. But that context is absent when playing them on an MP3 player. On an MP3 player, MOD files are just music, and I no more want a MOD file to repeat than I want my MP3s to repeat. Besides that, many MOD files were never written as game music. The MOD format has long been a popular compositional format on the Amiga, and it has been used to cover music never written for games, such as the music of Scott Joplin or Jean-Michel Jarre.
It should not be difficult to provide the option of letting MOD files stop when they reach the end. Computer programs that play MOD files have been doing this all along. From about 1990 to 1997, I was regularly collecting and playing MOD files on my Amiga, and the software that played them stopped playing one MOD when it finished and started playing the next one. The software I have for playing MODs on my PC will also stop when a MOD finishes. So I'm sure it can be done on Rockbox.