Console Variables

This list is believed to be complete. From scans of GetCVarDefault for all likely strings.
"accountName" = ""
"alphaLevel" = "1"
"AmbienceVolume" = "0.6"
"anisotropic" = "1"
"assistAttack" = "0"
"autoClearAFK" = "1"
"autointeract" = "0"
"automoveturnspeednarrow" = "800"
"automoveturnspeedwide" = "1200"

"baseMip" = "0"
"BlockTrades" = "0"
"bspcache" = "1"

"cameraBobbing" = "0"
"cameraBobbingFrequency" = "0.8"
"cameraBobbingLRAmplitude" = "2.0"
"cameraBobbingSmoothSpeed" = "0.8"
"cameraBobbingUDAmplitude" = "2.0"
"cameraCustomViewSmoothing" = "0"
"cameraDistance" = "0.0"
"cameraDistanceMax" = "15.0"
"cameraDistanceMaxFactor" = "1.0"
"cameraDistanceMoveSpeed" = "8.33"
"cameraDistanceSmoothSpeed" = "8.33"
"cameraDive" = "1"
"cameraFoVSmoothSpeed" = "0.5"
"cameraGroundSmoothSpeed" = "7.5"
"cameraHeightIgnoreStandState" = "0"
"cameraHeightSmoothSpeed" = "1.2"
"cameraPitch" = "0.0"
"cameraPitchMoveSpeed" = "90.0"
"cameraPitchSmoothMax" = "30.0"
"cameraPitchSmoothMin" = "0.0"
"cameraPitchSmoothSpeed" = "45.0"
"cameraPivot" = "1"
"cameraPivotDXMax" = "0.05"
"cameraPivotDYMin" = "0.00"
"camerasmooth" = "1"
"cameraSmoothPitch" = "0"
"cameraSmoothStyle" = "1"
"cameraSmoothTimeMax" = "2.0"
"cameraSmoothTimeMin" = "0.1"
"cameraSmoothTrackingStyle" = "1"
"cameraSmoothYaw" = "1"
"cameraSubmergeFinalPitch" = "5.0"
"cameraSubmergePitch" = "18.0"
"cameraSurfaceFinalPitch" = "5.0"
"cameraSurfacePitch" = "0.0"
"cameraTargetSmoothSpeed" = "90.0"
"cameraTerrainTilt" = "0"
"cameraTerrainTiltTimeMax" = "10.0"
"cameraTerrainTiltTimeMin" = "3.0"
"cameraView" = "1"
"cameraViewBlendStyle" = "1"
"cameraWaterCollision" = "1"
"cameraYawMoveSpeed" = "180.0"
"cameraYawSmoothMax" = "0.0"
"cameraYawSmoothMin" = "0.0"
"cameraYawSmoothSpeed" = "180.0"
"ChatBubbles" = "1"
"ChatBubblesParty" = "0"
"checkAddonVersion" = "1"
"CombatDamage" = "1"
"CombatDeathLogRange" = "60"
"combatLogOn" = "1"
"CombatLogPeriodicSpells" = "1"
"CombatLogRangeCreature" = "30"
"CombatLogRangeFriendlyPlayers" = "50"
"CombatLogRangeFriendlyPlayersPets" = "50"
"CombatLogRangeHostilePlayers" = "50"
"CombatLogRangeHostilePlayersPets" = "50"
"CombatLogRangeParty" = "50"
"CombatLogRangePartyPet" = "50"
"CombatModeMaxDistance" = "30.0f"

"debugTaint" = "0"
"deselectOnClick" = "1"
"desktopGamma" = "0"
"DistCull" = "500"
"doodadAnim" = "1"

"EmoteSounds" = "1"
"EnableAmbience" = "1"
"EnableErrorSpeech" = "1"
"EnableGroupSpeech" = "1"
"EnableMusic" = "1"
"ErrorFilter" = "all"
"ErrorLevelMax" = "3"
"ErrorLevelMin" = "1"
"errors" = "0"

"farclip" = "350"
"ffxDeath" = "1"
"ffxGlow" = "1"
"footstepBias" = "0.125"
"FootstepSounds" = "1"
"frillDensity" = "16"
"fullAlpha" = "0"

"gameTip" = "0"
"gamma" = "1.0"
"guildMemberNotify" = "0"
"gxApi" = "direct3d"
"gxAspect" = "1"
"gxColorBits" = "16"
"gxCursor" = "1"
"gxDepthBits" = "16"
"gxFixLag" = "1"
"gxMaximize" = "0"
"gxMultisample" = "1"
"gxMultisampleQuality" = "0.0"
"gxOverride" = ""
"gxRefresh" = "75"
"gxResolution" = "640x480"
"gxTripleBuffer" = "0"
"gxVSync" = "1"
"gxWindow" = "0"

"horizonfarclip" = "2112"
"hwDetect" = "1"

"Joystick" = "0"

"lastCharacterIndex" = "0"
"lodDist" = "100.0"

"M2BatchDoodads" = "1"
"M2Faster" = "1"
"M2FasterDebug" = "0"
"M2UseClipPlanes" = "1"
"M2UsePixelShaders" = "0"
"M2UseShaders" = "1"
"M2UseThreads" = "1"
"M2UseZFill" = "1"
"mapObjLightLOD" = "0"
"mapObjOverbright" = "1"
"mapShadows" = "1"
"MapWaterSounds" = "1"
"MasterSoundEffects" = "1"
"MasterVolume" = "1.0"
"MaxLights" = "4"
"minimapInsideZoom" = "3"
"minimapZoom" = "3"
"mouseInvertPitch" = "0"
"mouseInvertYaw" = "0"
"mousespeed" = "1.0"
"movie" = "1"
"movieSubtitle" = "0"
"MusicVolume" = "0.4"

"nearclip" = "0.1"

"ObjectSelectionCircle" = "1"
"occlusion" = "1"

"particleDensity" = "1.0"
"PetMeleeDamage" = "1"
"PetNamePlates" = "0"
"PetSpellDamage" = "1"
"pixelShaders" = "0"
"PlayerAnim" = "0"
"PlayerFadeInRate" = "4096"
"PlayerFadeOutAlpha" = "128"
"PlayerFadeOutRate" = "4096"
"profanityFilter" = "1"

"readContest" = "0"
"readEULA" = "0"
"readScanning" = "0"
"readTOS" = "0"
"realmList" = "us.logon.worldofwarcraft.com:3724"
"realmName" = ""

"scriptMemory" = "49152"
"shadowBias" = "0.1"
"shadowLevel" = "1"
"shadowLOD" = "1"
"ShowErrors" = "1"
"showfootprintparticles" = "1"
"showfootprints" = "1"
"showGameTips" = "1"
"showLootSpam" = "1"
"showsmartrects" = "0"
"SkyCloudLOD" = "0"
"smallCull" = "0.04"
"SoundBufferSize" = "50"
"SoundDriver" = "-1"
"SoundInitFlags" = "128"
"SoundListenerAtCharacter" = "1"
"SoundMaxHardwareChannels" = "12"
"SoundMemoryCache" = "4"
"SoundMinHardwareChannels" = "-1"
"SoundMixer" = "-1"
"SoundMixRate" = "44100"
"SoundOutputSystem" = "-1"
"SoundReverb" = "1"
"SoundRolloffFactor" = "4"
"SoundSoftwareChannels" = "12"
"SoundVolume" = "1.0"
"SoundZoneMusicNoDelay" = "0"
"specular" = "0"
"spellEffectLevel" = "2"
"statusBarText" = "0"

"TargetAnim" = "0"
"targetNearestDistance" = "41.000000"
"targetNearestDistanceRadius" = "10.000000"
"texLodBias" = "0.0"
"textureLodDist" = "777.0"
"triangleStrips" = "1"
"trilinear" = "0"

"UberTooltips" = "1"
"uiscale" = "1.0"
"unitDrawDist" = "300.0"
"UnitNameNPC" = "0"
"UnitNameOwn" = "0"
"UnitNamePlayer" = "1"
"UnitNamePlayerGuild" = "1"
"UnitNamePlayerPVPTitle" = "1"
"UnitNameRenderMode" = "2"
"useUiScale" = "0"
"useWeatherShaders" = "1"

"violenceLevel" = "2"

"waterLOD" = "0"
"weatherDensity" = "2"
"widescreen" = "1"
Explanations

targetNearestDistance: Tab targetting distance in front of you
targetNearestDistanceRadius: Tab targetting behind you? (Not tested)
violenceLevel: 0-2.; 0 - No hit animations whatsoever; 1 - Hit flashes + green(?) blood (perhaps somewhat lesser extent); 2 - Hit flashes + red blood; 3 or higher does not change anything, at least not for regular melee.