I don't know there's an "all good" answer to this.
This for instance is my conf.ini [Mods] section, but it's a conf.ini I share across many games, some of them development versions, so not everything in there might even be valid for BAT:
[Mods]
PrintFMDinfo=1
WW1AircraftRadio=0
HUDLogLines=12
HUDLogColor1=FFFFFFFF
HUDLogColor2=FFFF0000
HUDLogBottomColor1=FF0000FF
HUDLogBottomColor2=FF00FFFF
P47PackNewFM=1
CatapultBoost=1
PALQMBLinesMap=24
PALQMBLinesPl0=24
PALQMBLinesPl1=18
PALQMBLinesPl2=18
PALQMBLinesPl3=17
PALQMBLinesPl4=18
PALQMBLinesPl5=18
PALQMBLinesPl6=24
PALQMBLinesPl7=24
BombToStart=1
RocketToStart=1
DropBombDelay=1
Flyby=0
DragMod=1
netCallsign=
ShowOnlineCompatibleFlightModelChanges=1
PALGameMenuStatusBar=1
PALGameMenuShowFPS=0
PAL3DStart=0
PAL3DSepAim=0.7
PAL3DSepGun=1.35
PAL3DSepPit=1.5
PAL3DSepExt=25.0
PAL3DConvAimL=-0.05
PAL3DConvAimR=-0.05
PAL3DConvGunL=-0.09
PAL3DConvGunR=-0.09
PAL3DConvPitL=-0.13
PAL3DConvPitR=-0.13
PAL3DConvExtL=-0.55
PAL3DConvExtR=-0.55
RandomSplash=1
PAL3DCockpitSoftViewEnabled=0
PAL3DCockpitSoftView=0.075
PAL3DCockpitTurretInertiaEnabled=0
PAL3DCockpitTurretInertia=0.0010
PAL3DFollowInertiaEnabled=0
PAL3DFollowInertia=0.009999999776482582
PAL3DFollowInertiaAngle=0.01
PAL3DExternalSoftView=0.075
PAL3DExternalTrackIR=0
PAL3DExternalMouseInertia=0
WepEffect=0
PALHUDMode=0
SpeedbarUnits=1
SpeedbarTAS=0
SpeedbarSIToo=1
SpeedbarShowExtraInfo=1
PAL3DDOFfNumber=0.0
PAL3DDOFFocus=56.67
PAL3DAdjustVariable=1
PAL3DFullColorFrames=0
PAL3DRenderStereo=1
PAL3DFilterLeft=R___
PAL3DFilterRight=_GB_
PAL3DMaxMenuActors=0