Those abilities used to be named exactly as the song. Also some of the song names stayed the same, like Hurt (even though he covered it).
For anyone who is curious, the copyright on Cash's songs does not limit in any way Wyrd's or anyone else's ability to name things after them. A copyright is protection for a work of art in its entirety. Therefore Wyrd would have to produce and publish the actual song to infringe upon the copyright. The name of the song would have to be trademarked for it to offer any protection, which is highly unlikely for a song. It might have been trademarked for the movie though. Walk the Line is the name of the tattoo shop I go to. Anyone could find out right now if it was trademarked by doing a simple search on the uspto.gov website.
Sue is simply a name and cannot be trademarked, and even if it were the name of the song is not Sue.
There is also a general rule that parody is safe from copyright or trademark infringement because of the value it provides to society. The names of the abilities could almost certainly be seen as such. Legally, they most likely did not need to change the names of any of it. They probably just wanted to be careful or thought the modified names were better since everyone would get the joke anyways.