knowing the notes of the chord you are trying to play over, all over the neck. what is it good for? lol great for arpeggios, great for sounding like you have some target notes in mind and not like you are just practicing scales over a chord. my tone is joking ( best of intentions) , but seriously, there's a lot you can do with that.
try doing the four chord shapes of a dominant chord on the top three strings, up the neck.
or,
learn one for A dom, D dom, and E dom, right in the vicinity of the fifth fret, and try to change them over the chord progression with your own creativity and sync.