Making how it installs mods user choice via addon's is good, but at the least give the base program a choice of a "virtual" install (symlinks/hardlinks/vfs) and a straight to the Data folder install would probably make the most people happy (even if "virtual" is the default). Making all folder locations user defineable during install and not requiring them to be manually moved after install via witchcraft and luck is very high on my list. I have lots of hard drive space but I install nothing but the bare minimum on my boot drive. It should be easy and in my opinion the default choice to install all files into the directory you install the application. Have it default to a folder off the root of the drive that game that is being installed to instead of Program Files if necessary. That being said both NMM and MO are excellent programs in their own right (I haven't used Wrye much so can't comment on it) so I am excited to see what piece of art comes from a collaboration of the creators of both.
