> - Have a separate anyvimishthing directory, and make both vim and > neovim look there, and only make plugins that have been tested to work > with both install to that directory.
Actually it is almost the thing I described as "second" eselect variant. Although, you suggest for gentoo devs to check modules work (and we're all know that it can take eternity), while I suggest to give users a tool to rule that on their own.