CallMF 2.0 is directly descendend of CallMF 1.0, provided with either PasTEX or METAFONT 2.71. There have been many hands working on CallMF since 1991. CallMF 1.0 was written and developed by Martin Bokämper, Georg Heßmann, Jörg Höhle, and Ulrich Wisser. For my own distribution of METAFONT 2.71 in 1993 and 1994, I made several minor changes to the scripts.
Although the names MakeBatch.rexx and MakeTeXFont.rexx are the same in both versions of CallMF, they should absolutely not be mixed in any way. CallMF 2 works completely different than version 1.
Ulrich Wisser's MakeTeXFontSet.rexx script is not included in version 2 of CallMF. As the author warns about its use, I don't support it. Maybe somebody will come up with a better idea for creating sets of related fonts automatically.