How to set up multi-dimensional DUB package configuration?

[Dukc]

My application has two copyright holders, so I want to be able to 
specify in the build command whose copyright marks get compiled 
to the program. D part of the application is built by DUB. DUB 
configurations would do the trick, but they are already used to 
define different editions of the application. I have to be able 
to choose the edition indepently of the copyright holder.

I don't necessarily need two-dimensional configuration. If there 
a way to order DUB to define an extra D version without altering 
`dub.sdl` to do that, it would suffice. But is there?