I've discovered that values don't get loaded into GameVariables from save files unless their key had already been added to GameVariables (namely, in main.txt), so I added a note about it to the kDict reference.

While I was at it, I also finally got around to updating the kAI page with the unlisted flags that Behemoth clued me into a while ago.

New version is up.  It's got the new options menu in place of the old addon system, which includes a new enemy respawn setting (thanks to BehemothProgrammer for figuring out how to suppress respawns), and more levels for the taunt system beyond just on/off.

There're also new models for the assault rifle (including an optional muzzle brake):

Okay, I think I have the menu code neatly encapsulated now.

You'd use something like this to trigger initial setup when starting a new game.  It'll handle everything automatically, including a GameVariable to prevent triggering again when re-entering the level.  Help boxes don't seem to display during cutscenes, so rather than doing this before the hub cutscene, I put this in script 0 for level 4 (the start of level 1).
ActorFactory.Spawn( "TurokPlusSetup", 0,0,0, 0 );
And I spawn an access point in the hub by adding this to script 0 for level 5.  Naturally, you'd change the location and rotation to whatever suits your map.
kVec3 v( -1575-50, 4995, 972.8 );
ActorFactory.Spawn( "TurokPlusTerminal", v.x, v.y, v.z, Math::Deg2Rad(180),
Player.Actor().GetSectorIndexAtLocation(v) );
The spawns will silently fail if Turok+ isn't installed, so you should be able to safely add these to maps and mods to add Turok+ support without needing separate Turok+ versions of maps or map scripts.

I think all that's left to do now is to tie the settings to your save file.

edit: simplified initial setup even further with an obvious change I just realized.

Finally got around to trying this.  Here's some random thoughts:
Make the totem poles talk like gossip stones.
I killed all my friends, but they kept respawning.  Assholes.
You made me fight all those leapers for a pistol!?
Took a zipline to hell.  Skeleton raptor scared me. ):
Died by pepper.
The end.

I think I might be done with this now.  Maybe.  I can't seem to stop tweaking the damn thing.