You can use the following settings to configure access to code extensions.
EXTSVCEXT001 (EXT_DISABLE_ALL_TRIGGERS) 1
FRMCARINA032 (CODE_EXTENSION_BY_REST_ENABLE) 1
FRMCARINA039 (ENABLE_EXTENSION_CACHING) 1
FRMCARINA041 (ENABLE_EVENT_BUS_PROCESSOR_OVERRIDE) 1