Currently the way that the controls table works is that you give it an array of strings like so (taken from here:

controlBaseClassPath[] = {"RscDisplayTemp", "RscDisplayTemp_LineTextBase"};
//--- Is interpreted as:
configFile >> RscDisplayTemp >> RscDisplayTemp_LineTextBase;

Therefore it is not possible to use controls from the missionConfigFile, limiting the use of it to certain controls or mods.