Teds. You have writen an interesting article which gave an insight to you single fingered playing. This is not a criticism of single finger playing because a lot of players us it, but a number of single finger chords still require 3 keys to be pressed so one might as well learn fingered chords. The type of chords available with single finger is limited to just a few, but playing fingered chords gives you a vast list of chord options and inversions.
Plus as already mentioned above by Bruno you can add a nice left hand voice like guitar \ piano \ strings.

[This message has been edited by Graham UK (edited 06-22-2006).]