Note:  Sbt has a relativeTo and relativize functions, on path finder.  It's a bit fun to work with, but basically:

```scala
val pathFinder = confDirectory ** ("*" -- "routes")
val fileToRelativeName: Seq[(File, String)] = pathFinder x confDirectory

for((file, relativeName) <- fileToRelativeName)
yield file -> ("conf/" + relativeName)
```

Whatever is easiest for you :)  Just a note though that the current implementation will create very odd strings if people symlink configuration into the conf/ directory.  hopefully people don't actually do that (it's a bad idea), but hey, I've seen a lot :)