Boy, was I shocked. I had piles of odd entries that I'd never seen before. I certainly didn't add them, and I had no idea what they did, so I deleted them. Apparently that was a good thing - it let me disable my mod, and it seems to have made my game a bit more stable to boot.
My question, though: Where did they come from? Can mods add entries like that? I keep a log of all the changes I make to my load order - new mods, upgrades, etc. - but I'd be hard-pressed to say what caused it; I haven't opened my ini file in the better part of a year. Even basing it on the time period when the game suddenly got really unstable and odd things started to happen, none of the changes I made would suggest it.
Anyway, here's the list of entries. Maybe someone can make sense of it, or knows where they come from:
Spoiler
bDisableHeadTracking=0
bTrackAllDeaths=0
SCharGenQuest=0002466E
uiFaceGenMaxEGTDataSize=67108864
uiFaceGenMaxEGMDataSize=67108864
bCheckCellOffsetsOnInit=0
bCreateShaderPackage=0
uGridDistantTreeRangeCity=4
uGridDistantCountCity=4
bWarnOnMissingFileEntry=0
iSaveGameBackupCount=1
bDisplayMissingContentDialogue=1
SSaveGameSafeCellID=2AEEA
bAllowScriptedAutosave=1
bPreemptivelyUnloadCells=0
iNumBitsForFullySeen=248
iPreloadSizeLimit=104857600
SOblivionIntro=
bUseHardDriveCache=0
bEnableBoundingVolumeOcclusion=0
bDisplayBoundingVolumes=0
bUseThreadedTempEffects=0
bUseThreadedParticleSystem=0
bUseMyGamesDirectory=1
bCheckIDsOnInit=0
[LoadingBar]
iMoveBarWaitingMilliseconds=10
iMoveBarChaseMilliseconds=100
iMoveBarMaxMilliseconds=2500
fLoadingSlideDelay=15.0000
fPercentageOfBar3=0.1500
fPercentageOfBar2=0.4400
fPercentageOfBar1=0.3500
fPercentageOfBar0=0.0600
bShowSectionTimes=0
[BackgroundLoad]
bBackgroundLoadLipFiles=0
bLoadBackgroundFaceGen=0
bUseMultiThreadedFaceGen=1
bBackgroundCellLoads=1
bLoadHelmetsInBackground=1
iAnimationClonePerLoop=5
bSelectivePurgeUnusedOnFastTravel=0
bUseMultiThreadedTrees=1
iExteriorPriority=50
bCloneModelsInBackground=0
iBackgroundLoadFaceMult=200
fBackgroundLoadingPerLoop=20.0000
fBackgroundLoadClonedPerLoop=5.0000
iBackgroundLoadExtraMaxFPS=20
iBackgroundLoadExtraMinFPS=10
iBackgroundLoadExtraMax=3000
iBackgroundLoadExtraMin=5
iBackgroundLoadExtraMilliseconds=2
iBackgroundLoadTreeMilliseconds=7
iBackgroundLoadMilliseconds=1
iBackgroundLoadLoading=1
bUseBackgroundFileLoader=0
iPostProcessMillisecondsEditor=50
iPostProcessMillisecondsLoadingQueuedPriority=20
iPostProcessMilliseconds=5
[LOD]
fItemLODMax=15.0000
fItemLODMin=1.0000
fItemLODDefault=2.0000
fActorLODMax=15.0000
fActorLODMin=2.0000
fActorLODDefault=5.0000
bLODUseCombinedLandNormalMaps=1
bForceHideLODLand=0
fLODQuadMinLoadDistance=262144.0000
fLODFadeOutActorMultInterior=1.0000
fLODFadeOutItemMultInterior=1.0000
fLODFadeOutObjectMultInterior=1.0000
fLODFadeOutActorMultCity=0.8000
fLODFadeOutItemMultCity=0.8000
fLODFadeOutObjectMultCity=0.8000
fLODFadeOutActorMultComplex=1.0000
fLODFadeOutItemMultComplex=1.0000
fLODFadeOutObjectMultComplex=1.0000
fLODLandVerticalBias=0.0000
[Grass]
fGrassWindMagnitudeMax=125.0000
fGrassWindMagnitudeMin=5.0000
fTexturePctThreshold=0.3000
[Landscape]
iLandBorder2B=0
iLandBorder2G=0
iLandBorder2R=0
iLandBorder1B=0
iLandBorder1G=255
iLandBorder1R=255
[Messages]
bSkipInitializationFlows=1
bDisableHeadTracking=0
bTrackAllDeaths=0
SCharGenQuest=0002466E
uiFaceGenMaxEGTDataSize=67108864
uiFaceGenMaxEGMDataSize=67108864
bCheckCellOffsetsOnInit=0
bCreateShaderPackage=0
uGridDistantTreeRangeCity=4
uGridDistantCountCity=4
bWarnOnMissingFileEntry=0
iSaveGameBackupCount=1
bDisplayMissingContentDialogue=1
SSaveGameSafeCellID=2AEEA
bAllowScriptedAutosave=1
bPreemptivelyUnloadCells=0
iNumBitsForFullySeen=248
iPreloadSizeLimit=104857600
SOblivionIntro=
bUseHardDriveCache=0
bEnableBoundingVolumeOcclusion=0
bDisplayBoundingVolumes=0
bUseThreadedTempEffects=0
bUseThreadedParticleSystem=0
bUseMyGamesDirectory=1
bCheckIDsOnInit=0
[LoadingBar]
iMoveBarWaitingMilliseconds=10
iMoveBarChaseMilliseconds=100
iMoveBarMaxMilliseconds=2500
fLoadingSlideDelay=15.0000
fPercentageOfBar3=0.1500
fPercentageOfBar2=0.4400
fPercentageOfBar1=0.3500
fPercentageOfBar0=0.0600
bShowSectionTimes=0
[BackgroundLoad]
bBackgroundLoadLipFiles=0
bLoadBackgroundFaceGen=0
bUseMultiThreadedFaceGen=1
bBackgroundCellLoads=1
bLoadHelmetsInBackground=1
iAnimationClonePerLoop=5
bSelectivePurgeUnusedOnFastTravel=0
bUseMultiThreadedTrees=1
iExteriorPriority=50
bCloneModelsInBackground=0
iBackgroundLoadFaceMult=200
fBackgroundLoadingPerLoop=20.0000
fBackgroundLoadClonedPerLoop=5.0000
iBackgroundLoadExtraMaxFPS=20
iBackgroundLoadExtraMinFPS=10
iBackgroundLoadExtraMax=3000
iBackgroundLoadExtraMin=5
iBackgroundLoadExtraMilliseconds=2
iBackgroundLoadTreeMilliseconds=7
iBackgroundLoadMilliseconds=1
iBackgroundLoadLoading=1
bUseBackgroundFileLoader=0
iPostProcessMillisecondsEditor=50
iPostProcessMillisecondsLoadingQueuedPriority=20
iPostProcessMilliseconds=5
[LOD]
fItemLODMax=15.0000
fItemLODMin=1.0000
fItemLODDefault=2.0000
fActorLODMax=15.0000
fActorLODMin=2.0000
fActorLODDefault=5.0000
bLODUseCombinedLandNormalMaps=1
bForceHideLODLand=0
fLODQuadMinLoadDistance=262144.0000
fLODFadeOutActorMultInterior=1.0000
fLODFadeOutItemMultInterior=1.0000
fLODFadeOutObjectMultInterior=1.0000
fLODFadeOutActorMultCity=0.8000
fLODFadeOutItemMultCity=0.8000
fLODFadeOutObjectMultCity=0.8000
fLODFadeOutActorMultComplex=1.0000
fLODFadeOutItemMultComplex=1.0000
fLODFadeOutObjectMultComplex=1.0000
fLODLandVerticalBias=0.0000
[Grass]
fGrassWindMagnitudeMax=125.0000
fGrassWindMagnitudeMin=5.0000
fTexturePctThreshold=0.3000
[Landscape]
iLandBorder2B=0
iLandBorder2G=0
iLandBorder2R=0
iLandBorder1B=0
iLandBorder1G=255
iLandBorder1R=255
[Messages]
bSkipInitializationFlows=1