HUGE thanks to AWil335i (a fellow Indy member) who took time to show me his 335i and helping me flash the TCU.
Refer to the thread here:
http://www.e90post.com/forums/showth...7#post13568707
I was curious to see what "grandma mode" meant and sure enough, if you're not stepping on it, the car will shift promptly at 2K RPM in D mode, but I'm finding that I'm OK with it in city driving.
S mode & M mode are AWESOME. Are the shifts quicker? Yes, absolutely. Is it Porsche PDK quick? No, but close enough on upshifts. Downshifts are great - the car already did rev matching before but now it seems to rev match quicker (as soon as I pull on my "-" paddle), but it's of course not PDK/DCT quick. Still, I'm extremely happy and would recommend this to anyone whose transmission is compatible with the software.
The slight change in display too is nice: "D" now shows "D1 ~ D6", "DS" is now "S1 ~ S6", and M1 ~ M6 as before.