Can vouch for this - Kalu fitted MFSW buttons to my '08 ED30 with DSG - no coding was required, but he did scan for faults after
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As my car only has the midline display, the VCDS shows an error as I still have the original wiper stalk, which has the MFD menu rocker switch on the end of it. The car sort of gets confused (I think) as it has a feed for scrolling the MFD display also via the MFSW controls.
If I ever find a set of highline 974A GTI dials, then I hope to have the stalk changed at the same time to eliminate the error.
Still, love the MFSW buttons - always found the reach to the volume knob on the mkv a bit further than it was in my mkiv, so a very worthwhile 'mod'!