Well Ducimus since you so graciously volunteered all this information, perhaps you'd like to take a stab at it? 
My guess would be "Sleepcoef" or "EfficiencyDenominator". I'm too tired to test now but I'm sure CCIP will be along soon 
-------------->from UnitParts2VIIA.UPC
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[UnitPart 1]
ID= VIIATower
Type= VIIAConningTower ;Can only placed on unit parts slot of this type
NameDisplayable= VIIA-Conning-Name
Info=VIIA-Conning-Info
Notes=VIIA-Conning-Notes
UnitPartInterval=NULL, NULL
ExternalLinkName3D= Conning_7a_01,data\Submarine\NSS_Uboat7a\Submarine Parts\Conning_7A_01
HullTextureNameOverride=NULL
HullLightmapTextureNameOverride=NULL
HullNormalmapTextureNameOverride= NULL
MenuSilhouetteTextureNameOverride= data\Textures\TNormal\tex\7A.dds
ImageIndex=42
TrackingID=100
;------------------------------------------------------------
; COMPARTMENTS STRUCTURE
;------------------------------------------------------------
[UnitPart 1.Compartment 1]
CompartmentType= 2
StatusActive= No
ID= VIIAConnWatch
NameDisplayable= Gun-Compartment-Name
Type=NULL
FunctionalType= FlakRoom
MechanicalCoef= 0.3
ElectricsCoef= 0
GunsCoef= 0.4 ;0..1
WatchmanCoef= 0.3
WatchStandingCoef= 0.048
MaintenanceCoef= 0.0144
RepairsCoef= 0.072
ReloadingweaponCoef= 0.072
SleepCoef= -0.12
LeadersSlots=0
CrewMembersSlots= 0
EffciencyDenominator=2
EffciencyDenominatorBS=2
Hitpoints=200
CrewExposure=0.5
EquipmentsExposure=0.1
WeaponsExposure=0.1
ExternalDamageZoneTypeID3D= 31
GUIPlaceHolderIndex=6
DamageDescription1= NULL, 0, 0.2, 0, 1, 1, Minor damage, 0, 0, NULL, 0, 0.2, 0.2
DamageDescription2= NULL, 0.2, 0.6, 0, 1, 1, Medium damage, 0, 0, NULL, 0, 0.2, 0.5
DamageDescription3= NULL, 0.6, 1, 0, 1, 1, Heavy damage, 0, 0, NULL, 0, 0.2, 1
;------------------------------------------------------------
; CREWMEMBER SLOTS
;
;
;Type= Officer ;for Officers slots, which should be located in the Command Room and give bonus to the entire unit
;Type= Leader ;for Leaders slots, which give bonus to the compartment
;Type= Crewman ;for crewmember slots, which work and get poor pay
;
;------------------------------------------------------------
; ******** DECK WATCH *********
; ******** FLAK *********
;************************************************* ***********
;
; COMPARTMENT EQUIPMENT & WEAPS
;
;************************************************* ***********
;------------------------------------------------------------
; DECK WATCH
;------------------------------------------------------------
[UnitPart 1.Compartment 1.EquipmentSlot 1]
ID= EqSlotPeriscopeHeads
NameDisplayable= EqSlotPeriscopeHeads-EquipmentSlot-Name
Type=NULL
AcceptedTypes=NULL
UserCustomizable=No
IDLinkEquipmentIntervalDefault1= NULL, NULL, EqpAttackPeriscopeHead
ExternalNodeName3D= NULL
ExternalDamageZoneTypeID3D= -1
GUIPlaceHolderIndex= 1
GeneralDescription= EqSlotPeriscopeHeads-EquipmentSlot-General-Description
TechnicalDescription= EqSlotPeriscopeHeads-EquipmentSlot-Tehnical-Description
[UnitPart 1.Compartment 1.EquipmentSlot 2]
ID= RadioAntenna
NameDisplayable= Radio Antenna
Type=NULL
AcceptedTypes= Radio
UserCustomizable=No
IDLinkEquipmentIntervalDefault1= NULL, NULL, EqpRadioAntenna
ExternalNodeName3D= D02
ExternalDamageZoneTypeID3D= -1
[UnitPart 1.Compartment 1.EquipmentSlot 3]
ID= RWRAntenna
NameDisplayable= Radar Warning Antenna
Type=NULL
AcceptedTypes= NULL
UserCustomizable=No
IDLinkEquipmentIntervalDefault1= NULL, NULL, NULL
ExternalNodeName3D= C02
ExternalDamageZoneTypeID3D= -1
[UnitPart 1.Compartment 1.EquipmentSlot 4]
ID= RWRAntenna2
NameDisplayable= Radar Warning Antenna
Type=NULL
AcceptedTypes= NULL
UserCustomizable=No
IDLinkEquipmentIntervalDefault1= NULL, NULL, NULL
ExternalNodeName3D= C01
ExternalDamageZoneTypeID3D= -1
;------------------------------------------------------------
; FLAK GUNS
;------------------------------------------------------------
[UnitPart 1.Compartment 1.WeaponSlot 1]
ID= VIIABowDeckGun
NameDisplayable= BowDeckGun-WeaponSlot-Name
Type=NULL
AcceptedTypes= NULL
UserCustomizable=No
IDLinkBunker= GunsAmmoBunker
IDLinkWeaponIntervalDefault1= NULL, NULL, NULL, NULL
ExternalNodeName3D= M01
ExternalObjectName3D= NULL
ExternalDamageZoneTypeID3D= -1
GUIPlaceHolderIndex= 3
GeneralDescription= BowDeckGun-WeaponSlot-General-Description
TechnicalDescription= BowDeckGun-WeaponSlot-Tehnical-Description
[UnitPart 1.Compartment 1.WeaponSlot 2]
ID= WpSlotLightFlack
NameDisplayable= WpSlotLightFlackVIIA-WeaponSlot-Name
Type=NULL
AcceptedTypes= NULL
UserCustomizable=No
IDLinkBunker= GunsAmmoBunker
IDLinkWeaponIntervalDefault1= NULL, NULL, NULL, NULL
ExternalNodeName3D= A01
ExternalObjectName3D= NULL
ExternalDamageZoneTypeID3D= -1
GUIPlaceHolderIndex= 8
GeneralDescription= WpSlotLightFlack-WeaponSlot-General-Description
TechnicalDescription= WpSlotLightFlack-WeaponSlot-Tehnical-Description
;************************************************* ***********
;
; UpgradePackSlot
;
;************************************************* ***********
[UnitPart 1.UpgradePackSlot 1]
ID= UpgDeckFlak
NameDisplayable= UpgRearFlak-Name
Type=NULL
AcceptedTypes=GerLightAA
UserCustomizable=Yes
IDLinkUpgradePackSlots= WpSlotLightFlack
IDLinkUpgradePackSlotsIntervalDefault1= NULL, NULL, UpackUb20mmSingle
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