be able to specify directories or wildcards in file lists

It would be convenient to be able to specify directories in file lists like this

Group {
    files: ['subdirectory', '*.cpp', '*.h']
}

Every qbs invokation must evaluate the wildcards / read the directory content and compare it to the resulting list of files from the build before.
The difference between the file lists must be taken into account just like standard adding / removing of a file from the project file.