customization - Can I disable the auto complete? in WordPress

I have a solution I tested, and it works.

The autocomplete for the tags is currently done via an ajax request to the file admin-ajax.php. The solution I would suggest is to block the processing of the request so that it doest return any result. I would do :

function_tag_suggest() { if( DOING_AJAX == true && $_GET['action'] == 'ajax-tag-search' && $_SERVER['HTTP_REFERER'] == admin_url( 'edit.php' ) ) { die; }
}
add_action('admin_init', 'no_tag_suggest');

The previous function verify:

1. if it is an ajax request
2. if the action paramater is 'ajax-tag-search'
3. if the referer url is the '/wp-admin/edit.php' page

If these 3 conditions are meet, result will be returned and the tag suggestionst displayed.

If you want to remove this autocomplete from all the pages,t the 'wp-admin/edit.php' only, you can do:

function_tag_suggest() { if( DOING_AJAX == true && $_GET['action'] == 'ajax-tag-search' ) ) { die; }
}
add_action('admin_init', 'no_tag_suggest');

I would suggest you to look at the code of 'admin-ajax.php' to see all the 'action' parameters there, thus all the ajax requests you can kill with similar methods.

I hope my explanation was clear. Don hesitate to ask me if you want more details or have any question.

Bounty for me? :)