sbt-assembly: option to skip generation of original build

[Nikolai Muhhin]

In my build script I have next configuration for one of submodules

  lazy val importrunner = Project(

    id = "cps-importrunner",

    base = file("cps-importrunner"),

    settings = defaultSettings ++ assemblySettings ++

      addArtifact(Artifact("cps-importrunner", "assembly"), sbtassembly.Plugin.AssemblyKeys.assembly) ++ Seq(

        jarName in assembly := "cps-importrunner.jar",

        test in assembly := {},

        mainClass in assembly := Some("cps.runner.Main")

        )).dependsOn(common % "test->test;compile->compile", upc2cps % "test->test;compile->compile")

Running sbt publish-local produces 2 jar files in my target. First is pure cps-importrunner.jar, second is cps-importrunner-assembly.jar. I need only last one, but without 'assembly' classifier. 
changing arifact description to addArtifact(Artifact("cps-importrunner"), sbtassembly.Plugin.AssemblyKeys.assembly) ++ Seq(

solves problem in some way, but it does pretty the same thing - creates pure cps-importrunner.jar first, and then creates assembled cps-importrunner.jar without 'assembly' postfix overwriting first pure jar.
This looks little bit tricky for me. 

Is there any other option to exclude generating of first pure jar ?

Thank you!