Passing NON PARAMETER values to an indicator constructor?

Trying to reference a custom indicator passing in values for intialisation - to no avail. The API documentation really isn't helpfull on this matter.

 

// What I want...
Indicators.GetIndicator<IchiIndicator>("USD/GBP", 9, 26,  52);
Indicators.GetIndicator<IchiIndicator>("USD/AUS", 9, 26,  52);
Indicators.GetIndicator<IchiIndicator>("USD/JPY", 9, 26,  52);

// This above is a problem - because I can only set up values that will be passed automatically
// declaring input parameters like so...

    [Parameter("Symbol")]
    public Symbol Pair { get; set; }

    [Parameter("FastLinePeriods")]
    public int FastLinePeriods { get; set; }

    [Parameter("SlowLinePeriods")]
    public int SlowLinePeriods { get; set; }

    [Parameter("SlowestLinePeriods")]
    public int SlowestLinePeriods { get; set; }

// I REALLY don;t want to have to set up these parameter input boxes just to pass the values
// to an indicator.
// I am baffled as to why I can't just create a constructor for my indicator with the desired //params in a constructor?!

// --------------------------------------------------------------------
   

Any ideas?

I also find the way you need to reference an indicator in a Robot reallly awkward. There is no explanation as to why I can't just instantiate an indicator object(seeing as it would extend the base indicator interface) and pass the constructor whatever the user desires.