Currently, the only way to disable a control directly in the config is through use of the onLoad UI Event Handler:

class MyDialog {
    ...
    class MyControl {
        ...
        onLoad = "(_this # 0) ctrlEnable false;";
        ...
    };
    ...
};

This is not ideal, instead, having the following available would be better:

class MyDialog {
    ...
    class MyControl {
        ...
        enabled = 0;
        ...
    };
    ...
};

As such, the introduction of an enabled = flag; control property would be appreciated.

@Terra found at least one occurence of enabled = 0; in the game files (configfile >> "RscDisplayArsenal" >> "Controls" >> "Info" >> "controls" >> "DLCIcon"), but we were unable to determine whether a common "enabled" control property already exists (and is not functional) or not.