This is from the official Scoundrel rules, "It is important to note that although you retain your weapons until they are replaced, once a Weapon is used on a monster, the Weapon can then only be used to slay Monsters of a lower value (less than equal) than the previous Monster it had slain."
Your house rule states, "You can only attack monsters of the SAME or LOWER limit attached to the weapon." In your program, the number attached to the weapon is the same as the last number slain and not one less. I'd like an option to play by the official rule.
When I play with actual cards, I leave the red aces in as epic items, 14 weapon and 14 health potion. I was requesting that my house rule be an option.