You can create your own Sets by adding set files to the sets directory in the CONFIG_DIR. A set file is a file where the filename (no file extension) corresponds to the set name, and the contents are a newline-separated list of mod atoms. Set files can also include comments (lines starting with #).

E.g. CONFIG_DIR/sets/mymods

# This is a list of mods

User sets with the same name as a builtin set will be ignored in favour of the builtin sets, as user sets have the lowest priority when loading.