Actually, not compressing the "*.rpack" files along all the other game files (Like in your conversion) is what actually makes his installer faster - And hence, the total time compressing the game files is smaller for this (Peterf) conversion.
And BTW, it's actually possible to "fix" this by tweaking the setup.ini from your (BAMsE) conversion. I don't know how to do that for "external", but with "zero compression" is pretty easy.
... And now we have two options, a "Complex, yet truly complete" (Peterf) one and a "Games for windows 'easy-as-cake'" (Yeber90's codes and BAMsE's work) one. But if you wanna know, we still need a option to make a 2xDVD5 full backup with all languages... Well... quite not this time...
Thanks for the hard work, all of you.