Roger,
What I'm really trying to do is figure out how to indicate that the 3rd, 4th & 5th string are to be played open and the other strings are not to be played. So is there a way to accomplish that? Those 3 strings played open should be the same form as an A played on the same strings on the 2nd fret - wouldn't it?
systems,
Seems like this might be a great place for some tableture? There is a monospaced command in ChordPro {start_of_tab} {end_of_tab} which should suit your purpose. Tableture should let you show which strings to play open and which not to, I would think.
The chordii software is still in development. The current version of the documentation is 4.5. There is a good decent PDF available, though well hidden at the chordii web site named chordii-4.5-user_guide.pdf. You could probably Google that and come up with it.