Trivial Description
The experimental property general.maven.project.basedir was created as a way of conveniently bootstrapping configuration pointing to a user's development environment, so that the target/classes directories could be easily injected onto the classpath for testing.
This really isn't necessary, since a developer can simply edit their classpath manually. It should be stripped out to move towards simplicity in an area which is already unnecessarily complex (scripts/classloaders).
(This would also imply removing the corresponding hidden -b, --basedir option from the bootstrap configuration script.)