1、配置文件.emacs的做法可以参考这篇(http://www.cnblogs.com/chinazhangjie/archive/2011/06/01/2067263.html)文章;
2、site-start.el的功能见如下原文描述:
Your site may also have a site startup file; this is named site-start.el, if it exists. Like default.el, Emacs finds this file via the standard search path for Lisp libraries. Emacs loads this library before it loads your init file. To inhibit loading of this library, use the option ‘--no-site-file’. See Initial Options. We recommend against using site-start.el for changes that some users may not like. It is better to put them in default.el, so that users can more easily override them.