there is my implementation for cross domain call using the requireJs text plug-in

htaccess file in the template folder of my cross-domain site

Header set Access-Control-Allow-Origin "*"

textremote.js

define(['text','module'],function (text, module) {

    // Load the cross-domain url from the config
    var remoteUrl         = module.config().remoteUrl;

    // Store the current parseName function into a var  
    var originalParseName = text.parseName;

    // Redefine the parseName function      
    text.parseName = function(name) {

        // Use the original parseName 
        var parsed = originalParseName(name);

        // append the cross-domain url to parsed.moduleName
        parsed.moduleName = remoteUrl+parsed.moduleName;

        return parsed;
    }

    // Force CORS to be true 
    text.useXhr = function () {
        return true;
    }
});

In the main config (I remove the non related config)

require.config(
    {
        textremote  : "libs/textremote",

        // this config will be accessible in textremote.js through the module parameters
        config : {
        "textremote" : {
            remoteUrl : "http://www.cross-domain-asset.com/template/"
        }
    },
    }
)

initialization

This ensure that textremote is load first and will ovveride the text.parseUrl and text.useXhr before any usage.

require(['textremote'],function(){
    require(['libs/app'], function(app){
        app.initialize();
    });     
})

Usage example

text!demo.tpl will pass through textremote and text plugin and use http://www.cross-domain-asset.com/template/demo.tpl

// Filename: app.js
define([
  'router', // Request router.js
  'backbone',
  'marionette',
  'underscore',
  'text!demo.tpl'
], function(Router,backbone,marionette,_, demoTemplate){
  var initialize = function(){
    // Pass in our Router module and call it's initialize function
    Router.initialize();

   /* ... */

  }

  return {
    initialize: initialize
  };
});

That it, So far this is working well for me. But I would like to improve it or know if better approach exists.

On a side note, I will add code to allow multiple cross-domain usage and caching.