Someone on another thread applied the term "Diddleian mode" to Irish music; it probably has applications here. John Hartford goes into a long thing on "ghost notes" on his banjo instruction tape too. In my case, though, it's not a question of making people think they hear notes that aren't there; it's a q. of making them sure they hear notes that are there. Clawhammer might be an option, though I do like the fullness of 3-finger if I can get to the point Chip talks about. Maybe I can get a grant to go to a desert island for about 17 mos. and develop this technique. Funny how long I resisted the idea of using non-standard tuning.