This plugin is made to allow server owners to alter the time allowed between creatures on a per creature basis. The minecraft default prevents players and mobs from being attacked more frequently than once per half second. With this, you will be able to increase or decrease this value to whatever you like.
mobsEffected: #Note, values measured in ticks. 20 ticks = 1 second skeleton: 10 zombie: 20 creeper: 5 player: 15 worldsEnabled: - world #list any worlds you want these changes to take place.