in the !setup.txt change these lines:
MonUpLvNeedKillCount0=10
MonUpLvNeedKillCount1=20
MonUpLvNeedKillCount2=50
MonUpLvNeedKillCount3=80
MonUpLvNeedKillCount4=120
MonUpLvNeedKillCount5=180
MonUpLvNeedKillCount6=250
MonUpLvNeedKillCount7=1200
to lower values..
pet leveling mobs are easy to do.. fill a room of mobs with low hp, ac, amc, dc and also exp if you don't want ppl to level up with them you can give them exp = 1.. then put a lvl value quite higher.. i choose 100 or 200 so that you are sure whatever pet you take will be lower lvl than it and just use rooms full of those to lvl up pets..