If you have a lot of templates, then you might want to considering merging them into a single file as an optimisation, but that is out of the scope of this plugin which is currently only concerned with template compilation.
The plugin is currently unpublished and very alpha. With that in mind you need to build from source... like a boss! Once you've done this and
publish-local'd you can add it to a project in project/plugins.sbt like so:
addSbtPlugin("eu.getintheloop" % "sbt-dustjs" % "0.0.1-SNAPSHOT")
And then add the settings in a build.sbt:
import dustjs.DustJsPlugin seq(DustJsPlugin.dustSettings: _*)
or in an SBT "full configuration" something like:
settings = DustJsPlugin.dustSettings
With the plugin added, you just need to place your dust templates in src/main/dust and then invoke
dust from the SBT 11.x shell.