im new to this stuff so just a question I've installed the plugin but where do i input the configuration u showed,
do i put in the same file after all the code thats written sorta stumped here ??? 
{
"General": {
"Disable decay for all entities": false,
"Exclude \"Other Multipliers\"": false,
"Use permission": false,
"Permission": "nodecay.use",
"Output": {
"Output to server console": false,
"Log to file": false,
"Log file name": "NoDecay-Log"
},
"Cupboard Settings": {
"Disable No Decay if resources placed in TC": false,
"Require Tool Cupboard": true,
"Any authed on TC": false,
"Cupboard Range": 30.0,
"Block cupboard wood": false,
"Block cupboard stone": false,
"Block cupbard metal": false,
"Block cupboard high quality": false
}
},
"Building grade multipliers": {
"Twig multiplier": 1.0,
"Wood multiplier": 0.0,
"Stone multiplier": 0.0,
"Sheet Metal multiplier": 0.0,
"Armoured multiplier": 0.0
},
"Other multipliers": {
"shortname": 0.0
},
"Use permission": "nodecay.use"
}

You should find the config under the oxide/config directory.