I had the same understanding as [@Drunken Conquistador].  Some conquests and sectors were entrusted to landed vassals, others fell under the control of centrally appointed governors.  How territory was managed or distributed would depend on the Emperor in question.  Doubtless there have been both centralization and decentralization efforts.

As for Vacare the int check listed them as having some precognitive and telekinetic powers.  That said I'd rather we go for a nuanced interpretation of void powers with the door to greater expressions left open.