When building a Maven2 project with several modules, I can specify different
build goals for every module, but the build just calls the main project's build
goals.

According to
http://www.nabble.com/Maven-module-build-override-doesn%27t-work--td22539208.html it's
not that this feature doesn't work, it's the problem that it can't work and
should have never been put into the GUI.