Currently, if a new version of beah introduces issues, it isn't possible to opt in to using an old version instead. A new "beah_rpm" ks_meta variable would allow this to be supported by providing the full package name such as "beah-0.6.48". ks_meta="beah_rpm=beah-0.6.48" The difference between this new metavariable and the alternate harness support is that all of the beah specific support in the kickstart files would still be enabled.
http://gerrit.beaker-project.org/2794
Beaker 0.15.4 has been released.