NRS the Embraer experience
We have a Narrow Runway Supplement for the EMB-135/145 series.
It required sim testing & cost $60K and then required the approval of the local regulator, the summary is as follows. The supplement is operator specific, I know only three operators have it as it was on the front page of the AFM SUP.
Allows ops to 23m runways, EMB would allow 20m
Has a Mini V1 between 101-104 kts
Has significant XWind limit reduction for both wet and dry runways
Has significant ops limitations for various systems for both MEL & QRH.
The major issue is, to have an engine failure at V1 (wet or dry max Xwind limit) and then not deviate more than 8 meters from the rwy centerline.
Thats how EMB do it, its been a long time since I last flew a Boeing Im not sure any of the few B717 operators will have ever required a NRS so Boeing may not have one on the shelf so to speak. I know it took us about 18 months of operating under a dispensation before the manufacturer and the regulator finally agreed to issuing approval.