One thing you certainly need more is a DSG stick. The stick has a build in controller which tells the box (via CAN) to change between neutral, drive, reverse etc. With the stick you can also do manual changes. So far I did not get the paddles to work, but I am still working on it.
Reverse light and speedo are two other things that are not working in my car.
I do not have a problem with gearing. I used a box from a MK5 Golf GTI, which has about the right gearing for my application (800 Kg RWD sportscar) I do have a lot less power however. The DSG is specified to handle max 350 Nm, some folk put a lot more to it and it survives. Increasing the pros sure on the clutch helps preventing clutch slip.
If you are searching for someone who might be able to put other software in your mechatronic you can contact JD engineering in the Netherlands.
He changed the software of my friens DSG in his golf mark 2. The clutch can handle now 450 Nm.