class Params {
  //Basic
  class DayTime
  {
   //paramsArray[0]
   title = "Time:";
   values[] = {6, 14, 17,20,23};
   texts[] = {"Sunrise","Day","Sunset","Evening","Night"};
   default = 14;
  };

  class ViewDistance
  {
   //paramsArray[1]
   title = "View Distance:";
   values[] = {1000,1500,2000,2500,3000};
   texts[] = {"1000m","1500m","2000m","2500m","3000m"};
   default = 1500;
  };

etViewDistance (paramsArray select 1);
paramsArray select (param number)

Actually in init.sqf we have this:
for '_i' from 0 to (count (missionConfigFile >> "MissionParameters"))-1 do {
      _ParameterName = (configName ((missionConfigFile >> "MissionParameters") select _i));
      _Value = if (isMultiplayer) then {paramsArray select _i} else {getNumber (missionConfigFile >> "MissionParameters" >> _ParameterName >> "default")};
      missionNamespace setVariable [_ParameterName, _Value];
};