I now found out you can drop a mpeg2-PS file produced with Avidemux on an App called DVDStyler and it will create a DVD for standalone players without re-encoding.
But! Only version 2.5 and 2.4.2 (which might have very old ffmpeg encoders, version 2.5.2 states ffmpeg 1.2 and DVDStyler 2.3 states "added support for libav 0.9 / ffmpeg 0.11 and chenged to use avconv tool to transcode.", no one knows what version might have been used up to 2.5 and from 2.4 on.)
I got highly criticised by a Windows person on another forum, for saying it doesn't work (the developer stated it worked under 10.9 but had coded it under 10.10 recently, he didn't answer what the older versions, e.g. 2.6 from 2013 were coded on). The fact that it has very low download times on soruceforge for the Mac version and this app has never crossed my way before on Mac Forums, makes me believe it is either not spread very much or it failed for other people, too, and they reported in Mac forums and the App got forgotten, because it was said to never work).
2.5 however (while not stating a re-encode) produces a 2400kbps file out of a ca. 2550kbps file, while 2.4.2 does create a file of the same file size as the soruce.