TYPO3 Core

Categories should be manually sortable using TYPO3's built-in sorting feature:

TCA:
$TCA['sys_category']['ctrl']['sortby'] = 'sorting';

SQL:
CREATE TABLE sys_category (
sorting int(10) unsigned DEFAULT '0' NOT NULL,
);

As the above doesn't seem to be enough to render the category tree in backend forms ordered by the sorting column, \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::makeCategorizable might also be modified?

Without having this feature, the usage of sys_categories in own extensions might pollute the sys_categories table / the tca, as each developer could intend to overwrite the tca and ext_tables in the own extension.