RandomizerNXT uses predictable pseudo-random values to set the token hash. 
RandomizerNXT.sol#L57
This can be used by users to predict the resulting token, and mint the most valuable ones, or with the rarest attributes, taking advantage over other legit users.
Separate the token hash assignment to a separate function, like the other randomizers do, and only allow trusted roles to execute it to prevent user from abusing it.
