It seems it would be simpler not to do any of this... nobody seems to have any problem with the new overtime score limit design. And I definitely don't see why someone would want to bring back the old behavior, even if it's possible to code a way to let it happen.

If you're concerned that playing until 2 points have been scored in Battle/Team Battle/Pestilence/Roast Tag, and until 1 point has been scored in CTF/DCTF/Jailbreak/Head Hunters, is too inflexible, you could base the number on a percentage of the current max score and/or time elapsed. There doesn't seem to be a reason to introduce a new invisible setting that everyone will forget about. Even if people did use it, they would presumably use it to express some consistent logic which could just be coded into the game.