Deactivating Custom Taxonomy selection in post.php and post-new.php

Hey guys,

I have several Custom Taxonomies added to a Custom Post Type. I don’t want them to be selectable by checkboxes in the post.php and post-new.php as it is by default so I used a Script to display them in a Select Box. That’s working so far but unfortunately I still get an additional box with the standard box.
When I deactive the display of the taxonomy within the Admin UI by the parameters the boxes disappear in the article interface just as in the sidebar of the Admin UI. I want to keep it in the Admin Sidebar so editors can still add/remove certain terms.

Is there any implemented option that makes this possible? I seem to be blind to find any build in solution.

I hope I could make my question understandable.

Thanks in advance,
Marvin