The original version disables CTF entirely for both teams when there is an imbalance (no one can pick up any flags...even their own team's). Constitution created a patch that changes this behavior so that only the stronger team cannot pick up the weaker team's flag and posted it in a reply to the above thread. Constitution's patch had a flaw, so he uploaded a new version. On the second page of the thread, Optic Delusion had attached fairCTFstrong which is essentially Constitution's path pre-applied.
Information on the usage of the fairCTF plug-in can be found in its README.