Why would you want a Vanator to be able to use a cloak? Maybe if it was an admin ship, but you can get an unbreakable admin shield for a fighter. And Administrator cannons can take down a battleship group in 10 seconds.
These Venators and Battlestars are so powerful as it is, that no stock ship can withstand a full salvo if it's loaded out right. Like 7 mortars and the rest Cerebruses. I've taken down NPC valors in 1 shot. I've taken down player Valors (with their permission, as a demonstration) who had cap V armor. Cap VIII will let a player survive a salvo, maybe Cap VII. But anything less they will be hurting bad or dead.