There are only two things that are not correct:
3) Regarding the crash, this happens if it is present in Env-Archive/Scalos, the file Menu13.prefs, the crash happens with any version of "Menu13.prefs", whether taken from OS3 or from "AROS-20180423-1-any-i386-contrib"
4) On AROS x86, there are no conflicts, as you can see from the archive "AROS-20180423-1-any-i386-contrib", Scalos on AROS X86, looks for its data files in the path:
Scalos:Themes\Default_Theme