Revision History is in fact now supported.
See: http://docbuilder.usersys.redhat.com/16913/#Changes_in_0.32.0
*** Bug 977578 has been marked as a duplicate of this bug. ***
Addressed in the "Known Issues" and "Back Matter" sections of the PressGang CCMS Handbook.
Closing this since PressGang docs are no longer being maintained, plus it was ON_QA for the a long time and looks correct at a glance.