That book is really good!
There's other interesting techniques, as I mentioned earlier Allan Holdsworth has another way to do it, he thinks scale wise, where chords can be any combination of the scale notes, he rarely constructs chords by triads, he often uses wide intervals mixed with very close intervals creating a "shape" and then moves the shape across the guitar neck using more or less the same intervals but with other scale notes.
This non-triadic chords has a very ambiguous sonority, so they can fit over various "regular" chords, i.e. if the tune has notated Dm7 - G7 - CMaj7 he can play a chord containing just g-d-e-f, that chord alone can fit over the whole progression but if he moves that shape up and down the scale, any resulting chord will fit also. Of course if you play this you will sound instantly like Holdsworth...