I understand you want to use tinymcedeluxe, but what I meant by custom module was that in most cases you will want to create a custom module to house the functionality that is specific to your site. I guess you can use Orchard without creating a custom module
if all you want to do is use the out of the box features like blogs. If that's what you are doing, the best way to do it is still to use a custom module -- even if all you are doing with the custom module is using it as a place to override the TinyMceDeluxe
The alternative, if you really don't want to use a custom module, is not recommended because it requires that you modify the TinyMceDeluxe module directly. This is bad practice because it means you will potentially lose your edits if you deploy to another
server or reinstall TinyMceDeluxe (e.g. a new version is released). If you are OK with this, then you can just copy orchard-tinymce.js from \Scripts\samples\ to \Scripts\, and modify that copy.
Then, modify the ResourceManifest.cs in TinyMceDeluxe, by adding this line at the end of the existing BuildManifests() method:
That should get you up an running.