the cut out mark to the right of the auto shifter in the titanium console? It is for the punchout when the G35X model is ordered as there is another switch added.
I wondered what it was for when I bought me car last Dec. Back then the X model was not released yet. Having seen the X model in person, I see the new switch installed in that location.

2004.5 DG 5AT SEDAN
Aero Sport Premium

 

My '03 Sedan was that way too.
Another thing I noticed was: in the tranny display in the dash: if you look carefully and get the right reflection, you can see an 'S' which of course doesn't light up on ours. I believe the JDM model (with a switch like our 'X') used this for 'S'lippery or 'S'now conditions.

<font color=red>GSM</font color=red>
<font color=red>GSM</font color=red>
<font color=black>Silverstone Coupe</font color=black>

 

thats funny cuz i called Infiniti and asked them why that S was there i was thinking maybe thers a Sport mode that i dont know about.. but the person said they had no clueee and call the dealerrhsip to find out..

Pictures...

 

I agree...probably for snow...and starting out in second...my dads e329 has that....s and w for summer and winter...