The clutch calibration thing is interesting. I don't have any experience with the Jazz i-shift but I have a Honda DCT bike, which appears to use quite similar technology and I suspect borrows system architecture.
The bike DCT (dual clutch transmission, one clutch for 1,3,5 and the other for 2,4,6 gear ratios) has a very simple clutch initialisation procedure, basically you press shift buttons when turning on ignition then a sequence (DDNDN) and it goes into initialisation mode, you start the engine and it does a procedure where it "learns" the oil pressures for clutch actuation to give the right bite points. It has to be up to temperature to do the procedure, if low it displays "L" and you have to warm it up more. It uses oil pressure to make the clutch grip rather than to release it, there are very light springs in the clutches which separate the plates.
I usually do it shortly after an oil change, allowing maybe 100mls or so for the new oil to stabilise. It takes literally a minute. A lot of non-Honda service technicians are not aware of the procedure but it can sort out a lot of driveability issues with pulling away or trickling in traffic, abrupt gear shift quality etc.
I would suspect there's a similar simple procedure for the i-shift, but maybe it needs a plug-in service tool?