I read https://unix.stackexchange.com/a/328354 and it convinced me that systemd indeed has to be rebuilt for this value to be changed.
Is this the case or does anyone have another solution for this? (Other than programming such feature and patching systemd with that.)
rc
script, and the alteration is to the generator that handles such scripts. Making the generator generate units differently is rather different to what you are talking about. Also note what I wrote about just not doing it that way at all in the first place, and what the questioner wrote about things that xe had tried. – JdeBP Jul 21 '17 at 07:34