That is true. Form names are auto-generated and require a find/replace to update later, which causes you to not be able to use the form builder for editing.
Really you should use the form builder to build the form and hand edit, since it does a better job of building than it does editing to begin with. The "edit" feature is reall a "rebuild".
If you want to create a form with your own form element names, you can create a simple form by hand that is properly named, then open the form builder with that form highlighted. That will cause the form builder to use the form names from your form.
We will probably need to add a feature to edit form names in the next version because so many people have requested it. Thanks for the feedback.