I dont think that this is a solution because when your pet is high level and you bring it along with your new character it sill do alot of 1hit Kills and your even though you are playing the legit way. it is part of the game mechanics.
I believe that the best solution if IMC really think it is a problem is that they log the characters out if there is no reaction for 10 minutes.
on the other hand about Z holding they can give each hold a 1 minute or 2 (what ever is enough) then the player has to unhold then hold again. this should stop the issue.
this is my opinnion.
