I'll start a new thread on this one...but DCT breakthroughs just happened in Russia in December 2017. Looks like we have an enterprising individual who has figured out how to put full M3 hardware on his 335is DCT and then flash the DCT TCU with the M3 GTS flash and have it fully operational. There are some quirks that are being worked out, but right now everything is showing as operational except the M Power button. They havent tested launch control yet, but all the different S1-S7 drive modes, D modes, and M modes work including M Dynamic mode, Drivelogic, and all DSC options. The DSC options is the more interesting one because that seems to foreshadow the capability of having DSC fully off during launch control like the M3.
Pay attention to the BOV sounds during the rev. Also notice the flaw with the tach having issues. But this is a 335is with fully functional M3 DCT controls: