Hi Brett,
Re highway economy: it depends how fast you go. 100kph on the speedo can see 6's. 120kph (about 114kph true) will see mid 8's.
DDC on soft is good for really bad roads but Normal is sometimes less nausea inducing depending on surface.
Turbo lag (in a manual anyway) only a problem in heavy traffic. It's not so much lag as opposed to no torque below 2500 rpm. Something I assume the Mk 7 won't have a problem with due to the fitment of variable exhaust timing pulling the power band down lower.
In summary: just do it.
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