Mike:
Create a mod file with a limited subset of layers of the main file is an old wish, that I have desired many time ago. The only workaround that I have found is to save not as a module but as a clipboard module by definig a layer combination that contains the desired subset of layers, selecting all with the marquee and copying before saving it. An annoying method, of course, but it works.
Another wish concerning modules would be the ability to show only part of a placed module, by defining a polygon that works as a 'mask', showing the external or the internal area. I think that it would be very useful.
Regards
Miquel
Capella & Garcia Arquitectura
AC18 - AC21, iMac 27" 3.1 Ghz Intel Core i7, 16GB Ram, OSX 10.13.1