TPF specific terms?????

[Invigilator]

That sounds like and adverb. In this case SWA describes how he went.

Clearly, as a locally created piece of speech, this has developed a versatility that will only be restricted by the methods of common usage.

The F word functions in the same manner. It can be all forms of speech.

All we need to be clear on is "what" the use of swa ultimately indicates.