Stower , here is the reason I ask is this.the effect is quite different,it is as different as up or down picking melody on a 5 string banjo.
now here is an English song in standard tuning,using modal dyads[two note chords,BUT i use one modal chord d modal 6/9 [d a a b e]
http://www.youtube.com/watch?v=ojVFPeU0YQU&feature=channel_page