The Moot is not as important as the library data entry implies.  While the Moot does confirm emperors and high noble appointments, it did not act to confirm those emperors who ascended by Right of Assassination.  Imperial Law is somewhat fuzzy on this point, and there exists in the Imperium no body which has the actual power to decide the question of whether such emperors were legitimate or not.  The answer comes de facto rather than de jure; that is, if an emperor succeeds in uniting the Imperium, history recognizes him as a legitimate emperor.  The Moot does not resist the inevitable -- to do so would merely destroy the illusion that Moot confirmation is required.

-cam MW
-IE ldr