I'm mostly coding in Java, which doesn't have named params... but I don't like either extra variable declarations just for this, nor mysterious booleans.

My current habit is to use comments for non-enforced named params; e.g.,

   fetchLatestFoo( long barId, false/*fetchContent*/ );

No compile-time checking, etc., but it still serves the purpose.

Yes, named arguments are a nice solution. Espeically if it can be forced (only passable by name).

You may love Ada:

    function Calc_Formula(A, B : Integer; Is_Gain : Boolean) return Float is ...

    X : Float := Calc_Formula(4, 5, Is_Gain => True);

Actually that was 'real' C#, so the language I'm working with does support this feature.

That said, Ada is certainly something I want to learn more about at some point.