Actually, I do use a sliding harmonic sometimes. I do a G harmonic chord at the end of a song, holding the G1 (E string, 3rd fret) fundamental. I hit the harmonics at the 5th fret, then with my right hand, go past the nut on the A string to press the string, and quickly pull the note up over the nut a whole step (2nd fret). Resolves the harmonic chord and sounds a lot like a pedal-steel bend.