Support for nested projects in includeFlat

Is there any plan to support nested projects in includeFlat? Currently you can use it to include only those projects which are at same level as root project.

I have very complex project structure where I have one to one mapping between a nested project and a git repository. I am using flat project structure as I am not very comfortable with git submodules or any other git feature for nested git repositories. There are other reasons too behind my decision of using a flat project structure which are difficult to explain here.