1.)itemgroup.txt there are tools you should use the search button.
2.)Go to you config.properties in your files and search for
Code:
# Special Animal EXP Event (Multiplicator for the 2 values above)
# Example: AnimalExpRateByKill = 5, AnimalExpRateByTime = 5 and AnimalExpEventBaseRate = 2. When you type ingame now "/animalexpeventon" you have 10x Animal EXP event.
# When you type "/animalexpeventoff" you will have 5x Animal EXP event.
AnimalExpEventBaseRate = 2
3.)Try some of the tools you find here.