Especially interesting options: 

Airbag Control Module:-Useful if airbags are to be removed or for aftermarket seats to disable seat sensors. I'd say best use for people that are stripping the car down...

Instrument Cluster:-Acoustic warnings for belts, key in ignition, frost warning - these are nice to quiet the car down a bit. If these beeps annoy you, they can be removed.-Cluster offset. The instrument cluster reads high by about 7-8%, this can be adjusted, so it's closer to actual speed.-Service interval. This has actually made the service interval feature useful to me. By default it's set to 25,000km or close to 15,000 miles, I've changed mine to 11,000km or close to 7,000 miles, now I can use this as my oil change interval instead of trying to remember halves.-enable M track mode indicator (2003 or later)-oil level display on OBD: link to threadpic of CSL manual discussing functionality: here

Light Control Module:-halogen highs on with xenon highsQuote:

Module Field Value PurposeALSZ PWM_WERT2_FL_BIXENON wert_01 Halogen High Beams

-fogs stay on with highsQuote:

Module Field Value PurposeALSZ FL_UND_NSW_NICHT_GLEICHZ nicht_aktiv Allows fogs with highbeams

-Check control and warm testing lights are useful for LED tail lights retrofit. If these are disabled, you won't get a dash light or blinking anymore.-Daytime running lights. These can be changed, activated or removed, quite a few items in this topic.Quote:

Module Field Value PurposeALSZ GED_FL_ALS_DRL nicht_aktiv Disable DRL

-Home shine - you can pick which lights you want for your home shine or "follow me home" lights.Quote:

Module Field Value PurposeALSZ HEIMLEUCHTEN wert_01-wert_05 changes how long the lights stay on (short to long)ALSZ HEIMLEUCHTEN_* aktiv/nicht_aktiv enable/disable pathway lighting for specified lights

-Euro sidemarkers - this disables the orange corner lights as running lights, they'll only work as turn signals, so no orange corners with the headlights on.Quote:

Module Field Value PurposeALSZ SIDEMARKER_US nicht_aktiv disables US-style parking lights

-triple blink turn signals Mid 2005 and later:Quote:

Module Field Value PurposeALSZ CYCL_TI_BLK dreimal enables triple-flash blinkers

-alternate 4 way flasher flash patterns Quote:

Module Field Value PurposeALSZ BLINKIMPULS_WARNBLK wert_04 Euro Hazards

Rearview mirror module:-Tilt mirror memory can be programmed, so you can adjust the mirror after it tilts down for reverse.Quote:

Module Field Value PurposeBTM MEMORY_SPIEGELABKLAPPEN aktiv User-Definable Reverse

Convertible top module:This module does not take coding and several people said they've burned theirs while trying to code. Shame...

General Module:-Alarm can be enabled (it's built into the car, so even if you don't have the siren, it'll start blinking the headlights).Quote:

Module Field Value PurposeGM5 DWA aktiv enables visual lock/unlock confirmation without alarm installed

-One touch close for coupe rear windows (with hardware mod)Quote:

Module Field Value PurposeGM5 KOMFORTSCHLIE_FB_O_FH_HI nicht_aktiv Remote Close Rear WindowsGM5 MAUT_N_ABBRECH_N_TUER_AUF aktiv Rear Window One Touch Close (GM5.C04+)GM5 MAUT_ZU_STOP_N_TUER_AUF nicht_aktiv Rear Window One Touch Close (GM5.C02)GM5 FH_TUEREN_HINTEN_TIPP_ZU aktiv Rear Window One Touch CloseGM5 FH_ZTR_SCHALTER_TIPP_ZU aktiv Rear Window One Touch Close

-One click unlock for both doors.Quote:

Module Field Value PurposeGM5 FERNBEDIENUNG_* nicht_aktv One Click Unlock (* represents key #)

-Open and close windows/sunroof/convertible top with remote. This can be customized.Quote:

Module Field Value PurposeGM5 KOMFORTSCHLIESSUNG_FB aktiv Remote Close Windows/Sunroof/Convert TopGM5 KOMFORTOEFFNUNG_FB aktiv Remote Open Windows/Sunroof/Convert Top

-Automatic locking based on time or speed. Speed can be customized.Quote:

Module Field Value PurposeGM5 VERRIEGELN_AUT_AB_X_KM/H aktiv Auto locking door at specified speedGM5 VERRIEGELUNGSSCHWELLE *See Below* Sets speed at which doors lock.klemme_r4_km/h8_km/h

12_km/h16_km/h20_km/h24_km/h28_km/h

-roll up windows remotely with keyQuote:

KOMFORTSCHLIE_FB_OHNE_SHD-Disable the boot open button on the key when the car is lockedQuote:

HKL_SPERREN_BEI_ZS aktiv-Automatically relock the car if a door is not opened within two minutesQuote:

VERRIEGELN_AUT_NACH_2_MIN aktiv-Keep car alarm enabled when car is unlocked using door key cylinder (most common way to break into an e46)Quote:

SCHAERFEN/ENTSCHAERFENschloss_und_fernbedienung ; key will disarm alarm by manual turn in door lock cylinder (default)nur_mit_fernbedienung ; key will not disarm alarm even if door lock cylinder is turned

AC/Heater system:-Automatic rear defroster. I love this, I haven't touched the button since I got my car.-alter interior temp sensor to taste-- so you can make a displayed 70º (on the CC screen) maintain 68º. Good if you have a PITA significant other that likes to keep it warm!

Radio:-Station key memory can be enabled, so you have different presets for different keys.

Seat Memory:-Automatic seat adjustment based on which key unlocked the car can be enabled. I can be set to change seat position as soon as you unlock the car with the remote. I see this being useful if you're a big guy and move the seat every time you get in. I don't use it.Quote:

Module Field Value PurposeSM AUT_SITZVERSTELLUNG nach_fb_entriegeln Seats Revert Memory Position When UnlockedSM AUT_SITZVERSTELLUNG nach_entr_u_tuer_oeffnen Seats Revert when Doors Opened

DSC module (full thread   here , this is a bit of a work in progress): -M track mode (2003 or later)-program car for ZCP brakes (2003 or later)Quote:

Add option code 7MA to the vehicle orderRecode the DSC module (MK60)Modify the parameters for the steering angle sensor and rear caliper if you didn't retrofit the corresponding ZCP bits.Recode the instrument cluster (AKMB)The bits that are important to enabling M-track mode seem to beTRAKTIONDIFFERENZREGELUNG

DTC_LAMPEand possibly PRE_MSR (Not really sure what this one does)DRUCKMODELL_HINTERACHSE is for the larger piston in the ZCP/CSL calipersLENKWINKELKENNLINIE_2 is for the quicker steering rack in the ZCP/CSLAlso you must recode the cluster for the M-track symbol to light up. The line you want to set is "ANZEGIE_HOCHLADEN" (set it to aktiv)

-it may be possible to alter the DSC intervention points. This is still under investigation-BAUART_MK60 seems to control when ABS intervenes (some people buy ZCP modules because apparently ABS doesn't kick in as early)

SMG module-- CSL programming-give you REAL launch control and faster shifts-thread here

AKMB   module: Quote:

GURTWARNUNGmit_gurtschlosskontakt* - enable visible seatbelt warning lampohne_gurtschlosskontakt  - disable visible seatbelt warning lampAKUSTIK_GURT_WARNaktiv*  - enable acoustic seatbelt warningnicht_aktiv - disable acoustic seatbelt warningWARNUNG_GESCHW_LIMITnicht_aktiv* - disable speed limit warning120_km/h - enable audible/visual speed limit warning for 120 km/h (~74 mph) (other speeds not available, unfortunately).