TYPO3 Core

Steps to reproduce:
Implement $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_tceforms.php']['getMainFieldsClass'][] hook with this function:

    public function getMainFields_preProcess($table, $row, $parentObject) {
        /** @var $parentObject \TYPO3\CMS\Backend\Form\FormEngine */
        $parentObject->renderReadonly = TRUE;
    }

While most of the fields will be read-only, tree fields (and IRRE --> separate issue) and trees will be writable.

Patch set 1 for branch TYPO3_6-2 of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at http://review.typo3.org/31815