If you are making modding tools,then you should make a complete awesome tool that can be used for
any type of players
for players who want to make game more challenging or who want to play game for only fun! then you should add option for editing weapon characterstics(such as editing its damage durability etc),player characterstics(such as editing player's health,stamina etc),number of zombies,attack power of zombie and even zombie's characterstics!!
because this would make many gamers satisfy thier style in their own way.......don't ya think
Also texture editing of some zombies can make your modding tool really awesome!!