You have no clue what you're talking about do you? It's not an 'add on', it's a theme, and a horribly outdated them at that. That was custom made for 3.9 Alpha 7, which was what Stepmaniax V5 was, and this is 3.9 Final.
Download the SMZIP located here:
http://www.laser1234...p?pid=et&fid=TE , place in /Packages, and then go into the Appearance Options and choose it. Oh, and make sure you delete that horrible outdated piece of crap before you do this.
About the d-pad not working, for some reason the config was changed in the v11 update. Go into the Config Key/Joy Mappings option and set the buttons accordingly.
"only one list of songs appear?" Either reload the songs via the Options menu, or check to see that you're in the folder sort where you only see one open set of songs at a time.
XPort, I gotta ask about something I noticed. Why is xboxpackage.smzip at least twice as big as it should be? There's apparently three copies of every file in-cluded. I extracted and rezipped with no recompression, and it's half the size @ 7mb.