Endurance Files + importing to R^3 engine

[jvizzlez]

Two quick questions: Firstly, I have the 1 hour 54 minute JS challenge simfile, but I cannot for the life of me find the 4 hour 140 bpm stream challenge, nor any other endurance files of the sort like Testament of Ian (though the latter is index/pad, having the file would be cool nonetheless).

Second: Is there any way to import Stepmania songs into the R^3 engine? I know of FFRMania and often find myself playing it regularly, but not all of the songs I often play are on it. I also prefer practicing on R^3 more because of how easily I'm able to manipulate rates (as compared with Stepmania).

Help would be appreciated!