JED 1.6.0+ - Custom Nether with 1:1 portal scaling

{
    "dimensions":
    [
        {
            "dim": -1,
            "override": true,
            "dimensiontype":
            {
                "id": -1,
                "name": "Nether",
                "keeploaded": false,
                "worldprovider": "WorldProviderHellJED",
                "require_exact_match": true
            },
            "jed": {
                "MovementFactor": 1
            }
        }
    ]
}