/changesetting: Changes a setting on a running dedicated server, like the allowed cheats or difficulty.
Syntax
<angle brackets> are required, [square brackets] optional. /changesetting has 3 forms:
/changesetting <setting: boolsettingname> <value: boolean>
/changesetting <setting: difficultysettingname> <value: difficulty>
/changesetting <setting: difficultysettingname> <value: int>