We obvious comprehend quite different meanings of the word "customize". To me, an extension to the language (such as Q::S) is not a customization, per se. A customization is something that changes the semantics of existing syntax.

So, if you were going to call my bluff, it should probably have been over a module like Inline::Files, where I do change the semantics of an existing construct!

Of course, you may well mean something quite different by "customization", in which case we're just arguing over (a different form of) semantics. ;-)