In my opinion, the only thing that 2016 has got wrong is not to flatten terrain along runways.
Of course, Orbiter only comes with a few bases and those are usable.
But the concept of rollercoaster runways following the terrain is odd. It should be the other way around.
Do we need an SVN repository for Elev_mod tiles? Any budding landscape architect could register as a contributor, and if they feel aggravated by the bump in the middle of their runway they could flatten it and submit it to the repository so that everybody else would also get the benefit. In the end I just scoop up all the contributions and bundle them in the next texture update.