In Dub, is there a way to specify the equivalent of the --combined command line argument in the json/sdl package config file?

What I'd like to be able to do is create a custom build type such that

    $ dub build --build=build-xyz

builds in combined mode, without needing to add the --combined on the command line. Putting it on the command line as follows did what I intended:

   $ dub build --build=build-xyz --combined

--Jon