Display lyrics.
As I posted
here, it's quite easy to create lyrics files for the songs, using the tutorial flag and the script.txt.
But FoF ignores all tutorials but the one in the tutorial folder, and when I looked through the sources I saw that FoF handles tutorials quite different than normal songs, though the only real difference is that the script file is used (and tutorials are meant to have only one difficulty, which could be ignored as well).
I don't see why this is, it seems to be a circumstantial way not show the tutorial in the normal song list. Its effect is that you can't use script.txt in normal songs in standard FoF.
So if the game (respectively the mod) just would use the script.txt for -any- song that has such a file (maybe ignore the PictureEvents), it would be possible to display lyrics.