I would like to move a file or folder from one place to another within the same repository without having to use Repo Browser to do it, and without creating two independent
As mentioned earlier, you'll create the add and delete commands. You can use svn move on both your working copy or the repository url. If you use your working copy, the changes won't be committed - you'll need to commit in a separate operation.
If you svn move a URL, you'll need to supply a --message, and the changes will be reflected in the repository immediately.