Joe- I guess I didn't do a very good job of expressing myself, based on your response of "...additional Thread tags for songs..." Personally, I couldn't give a rat's ass less about songs. I have little to no use for lyrics, and not much for tunes. I like to play around with chording and fingerpicking within scales. It seems to me that while this site is a great resource for singers, it is much less so for musicians. I want to know more about techinique for playing guitar - independent of what song/tune it might be.

Once upon a time, Rick started a thread called "What the 'F' is goin' on at Mudcat?" There is nothing in that title to say it's about guitar playing, nor is it about a particular song. If you didn't know it was out there, it would be hard to find. It does have some cross references in it, once you find it.
This thread, however, Licks, fills, embellishments? is not cross linked, and unless you happen to search on one of the words in the title you have no hope of finding it.

And I'm not suggesting it be limited to guitar - things like ornaments on the tin whistle ought to fit within the category as well, I should think. As well as techniques on all the other instruments that 'catters play.

Given that definition, does a specific prefix still seem like such an evil?