There are no branches in the game that stop the progress. In volleyball, the storyline doesn't end, you probably didn't understand the code.Looking at the mod, it's completely outdated.
(Turns out if you win too many times it fucks up the progression, so don't win until you get the option to harass your teammate and then only win 3 sets to unlock the story options).
If you want more granularity in opacity and color choice you can also put it in the format "#00000080".
I assume that the mod is also not outdated.
The public version has a file for highlighting the buttons, probably not the public version is posted here.