RANDOMA Multiplex seems to be a good, if not quite yet done, product.. Some sort of manual, or instruction page (even) would probably be very helpful. Although I notice that, in this regard, Multiplex is the norm, not the exception.
I realize that writing documentation takes time, and is not nearly as interesting a writing code, or planning the next great feature, and I realize that after you spend months, or years with your head inside a program, everything looks obvious, so why on earth would you need documentation anyway! But judging by the comments here, and in the Multiplex forum, a little tiny read me file would go a long way.
(Version 1.0.3)