Heavy Rain has only one ending confirmed!
I actually laughed at this.
But you know what, It might bug me when people make there credit unskippable (... is that a word?) but it bugs me even more when people complain about it.
If I spent a year (minimum) putting my blood sweat and tears into a game (whether it be a voice actor or a developer) I'D WANT PEOPLE TO KNOW !
Meaning these people made a masterpiece, let them tell you who they are..
That being said, after beating it for the first time there should be a skip option