Currently seam-gen only has the ability to manage one project at a time. This limitation is due to the fact that it sources build.properties from the seam-gen directory to read settings about the managed project. I propose that we make the name of the settings file dynamic so that it is possible for seam-gen to select it based on the name of a property supplied to the command line.
./seam -Dbuild=projecta explode
The first command would source build-projecta.properties. The second command would fall back to the existing behavior and source build.properties.