Potential enhancement to YUI's loader API allowing module-level skin selection and avoiding naming collisions.

complex-loader.js

YUI({
  groups: {
    group1: { modules: ["mymodule": {}], base: "http://group1..." },
    group2: { modules: ["mymodule": {}], base: "http://group2..." },
  }
}).use(
  // maintain current usage
  "node",
  // allow specifying skins at the module level
  { name: "slider", skin: "round-dark" /* or ["sam", "round-dark"] */ }, 
  // allow specifying groups to avoid naming collisions
  { name: "mymodule", group: "group2" }
), function (Y) {
 // your code is ready!
});