• Resetting mob spawn timer and other mob related functions
• Score related functions
• Individual survivor distance (either in % or points)
• Maximum map distance
• Total distance for the survivor team
• Some ability to read the score in the director (and possibly modify it without breaking the displays)
• Weapon related stuff (change stats?)
• Round Restart (for an improved ready-up)

Functions that have been tested and work:

_ZN16CTerrorGameRules17IsMissionFinalMapEv // Does exactly what it says!
_ZN16CTerrorGameRules27GetVersusMaxCompletionScoreEv // Flawless victory.
_ZNK16CTerrorGameRules31GetVersusCompletionPerCharacterE21SurvivorCharacterTypei // (int, int) First int is the character index (0, 1, 2, 3).  Second seems to be a team related index (2, 3) 2 gives the values for the current infected team, 3 gives them for the current infected team (0 if they haven't gone yet, N if they have gone). Values are given as points instead of %

And those that don't:

_ZN16CTerrorGameRules12RestartRoundEv // Resets the zombie manager and resets the survivor's back to the saferoom.  Door is still open but all weapons that were picked up are deleted.
_ZNK16CTerrorGameRules14GetRoundNumberEv // Tracks the rounds perfectly... for scavenge >.<

Some possibly useful stuff in CTerrorGameRules:

_ZN16CTerrorGameRules11InitScriptsEv
_ZN16CTerrorGameRules15GetChapterScoreEi
_ZN16CTerrorGameRules18IncrementTeamScoreEi
_ZN16CTerrorGameRules19GetVersusCompletionEP13CTerrorPlayer
_ZN16CTerrorGameRules19RecomputeTeamScoresEb
_ZN16CTerrorGameRules19UpdateChapterScoresEv
_ZN16CTerrorGameRules22IncrementCampaignScoreEi
_ZN16CTerrorGameRules25InitVersusCompletionScoreEv
_ZN16CTerrorGameRules25RecomputeVersusCompletionEb
_ZN16CTerrorGameRules27CalculateSurvivalMultiplierEb
_ZN16CTerrorGameRules27SetVersusSurvivalMultiplierEii

And some from the CDirector

_ZN9CDirector11FullRestartEv
_ZN9CDirector12OnRestartMapEv
_ZN9CDirector13ResetMobTimerEv
_ZN9CDirector14HideScoreboardEv
_ZN9CDirector15RestartScenarioEv
_ZN9CDirector20OnIncrementTeamScoreEv