One really cool aspect of having seven strings that I've been playing with recently is the potential for moving three-string melodic figures (like 313s, 213s, etc.) across three octave.
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one thing i enjoy alot with a 7 is that i like to naturally write riffs/melodies with big leaps in them, it often provides more interresting melodies than regular straight forward melodies that climbs up or down a couple of notes or so at a time. now, if im fingerjumping around, positioned say.. around 6-10th fret, i can still manage to get some pretty low bass tones thanks to having a 7th string, wich is a great addition to my style of play.
even tho the tones i reach would be somewhere around regular E, on a 6string i have no tone variation there at all (except hitting an open E wich is pretty limiting). so in my style of playing i use the 7th string on fret 5-12 most of the time.
*oompa immediately accepts that he did not make any sense at all*
Riffing, soloing, chords extensions ... All the time, in fact, as a part of the instrument and not an optional string.