Manual:$wgBlockAllowsUTEdit/ru

Подробнее
Set  to   to allow blocked users to edit their talk pages (so that they can request unblocking, for example). This will add a "" checkbox on Special:Block, unchecked by default (see Manual:Block and unblock). If it's set to, the checkbox disappears.

См. также
Основные настройки прав участников и блокировок: