It seems like it would be extremely complex to get the linkage from the shifter to the transmission...however, because electronic steering exists(and in some cases there is no mechanical connection between the steering wheel and rack), as well as throttle by wire, etc, and the DCT is basically a manual transmission, I don't understand why they don't just put in a clutch pedal that signals an electric throw out bearing, and add a stick shifter that's connected to a sensor that tells the transmission what gear the driver wants. So, even if it's not an actual manual transmission in the traditional sense, you can at least still feel and operate the car as if it was a manual. Plus manuals have been manipulated by computers for years now anyway (rev match downshifts, 1-4 skip shift, etc) so this seems like it wouldn't be too much of a jump to complete and as for cost, no matter if the customer selected a manual or auto, it would use the same transmission. Hell, hit a button on the dash and the manual could go in full auto mode for when you're sitting in stop and go traffic.