> this is difficult if you have to support (and betatest) MUI 3.8, MUI 3.9,
> MUI 3.9 on OS4, MUI4 on MorphOS, MUI4 on OS4 and MUI 4 on 68k.

Let's not forget MUI5 on MorphOS, MUI5 on OS4 and MUI5 on 68k ;-)