Since I play in a jug band with mandolin, banjo, guitars and fiddle and sometimes a trombone or Dobro, (jugs, kazoos, mouth harps and washboards don't use charts) when someone introduces a new song to the group, if it has complicated chord progressions the chords are written as they sound and if someone wants to capo, they will either write a chart of their own or transpose by ear. For rehearsals, we will often write the charts on large sheets of paper in marker, large enough for everyone to read.

If I write something for a student, I will write it using the names of the shapes rather than the actual pitch of the chords. For songs, the singer will decide on the key/capo placement. For fiddle tunes, there is usually a standard key; Red Haired Boy, for instance, might be played using G shapes on the guitar, but a capo would be used to put it in A to play with others.

I see from the fact that Rick Fielding, the one who introduced me to Mudcat many years ago, has posted, that this thread has been here for quite a while.