Pretender assassin - balance?

[JaydedOne]

Here's a theoretical question for you:

Should modders even consider assigning the #assassin flag to a Pretender they create? If so, what should they consider in the balancing and about how much is it, in itself, worth? Should it only go on human-type Pretenders (like an Arch-Mage) or should it be expanded to the mid-range types as well (such as, say, a Bog Mummy or Virtue)? Can anyone make an argument as to whether the big daddy Pretenders (in terms of hps, such as titans or Sons of Niefel) could have the flag and not be grotesquely overpowered?

Discuss, please.