I've just accidentally discovered an improvement that might help people. Perhaps it was there all along, and I missed it! Bar/measure 1 is what I wanted, and can now do without layering.
Previously, you could only have a rest in a chord if its length was shorter than the notes. Now, you can now also have a rest in the chord if it is the same length as the notes. You still can't have short notes and long rests in a chord. You still have to enter the rest first.
Bars 2 and 3 show some examples. You cannot beam notes.
There is still the problem with the semibreve (whole note) and minim (half note) rests, as in bar 4.
!NoteWorthyComposerClip(2.0,Single)
|Clef|Type:Treble
|RestChord|Dur:4th|Opts:Stem=Up,ArticulationsOnStem|Dur2:4th|Pos2:-6
|RestChord|Dur:4th|Opts:Stem=Down,ArticulationsOnStem|Dur2:4th|Pos2:-2
|Chord|Dur:4th|Pos:-8|Opts:Stem=Down|Dur2:4th|Pos2:-1
|RestChord|Dur:4th|Opts:Stem=Down,ArticulationsOnStem|Dur2:4th|Pos2:0
|Bar|Style:Double
|RestChord|Dur:Whole,Dotted|Opts:Stem=Up,ArticulationsOnStem|Dur2:Whole,Dotted|Pos2:-5
|RestChord|Dur:Whole|Opts:Stem=Up,ArticulationsOnStem|Dur2:Whole|Pos2:-5
|RestChord|Dur:Half,Dotted|Opts:Stem=Up,ArticulationsOnStem|Dur2:Half,Dotted|Pos2:-5
|RestChord|Dur:Half|Opts:Stem=Up,ArticulationsOnStem|Dur2:Half|Pos2:-5
|RestChord|Dur:4th,Dotted|Opts:Stem=Up,ArticulationsOnStem|Dur2:4th,Dotted|Pos2:-5
|RestChord|Dur:4th|Opts:Stem=Up,ArticulationsOnStem|Dur2:4th|Pos2:-5
|RestChord|Dur:8th,Dotted|Opts:Stem=Up,ArticulationsOnStem|Dur2:8th,Dotted|Pos2:-5
|RestChord|Dur:8th|Opts:Stem=Up,ArticulationsOnStem|Dur2:8th|Pos2:-5
|RestChord|Dur:16th,Dotted|Opts:Stem=Up,ArticulationsOnStem|Dur2:16th,Dotted|Pos2:-5
|RestChord|Dur:16th|Opts:Stem=Up,ArticulationsOnStem|Dur2:16th|Pos2:-5
|RestChord|Dur:32nd,Dotted|Opts:Stem=Up,ArticulationsOnStem|Dur2:32nd,Dotted|Pos2:-5
|RestChord|Dur:32nd|Opts:Stem=Up,ArticulationsOnStem|Dur2:32nd|Pos2:-5
|RestChord|Dur:64th,Dotted|Opts:Stem=Up,ArticulationsOnStem|Dur2:64th,Dotted|Pos2:-5
|RestChord|Dur:64th|Opts:Stem=Up,ArticulationsOnStem|Dur2:64th|Pos2:-5
|RestChord|Dur:8th,Triplet=First|Opts:Stem=Up,ArticulationsOnStem|Dur2:8th|Pos2:-5
|RestChord|Dur:8th,Triplet|Opts:Stem=Up,ArticulationsOnStem|Dur2:8th|Pos2:-5
|RestChord|Dur:8th,Triplet=End|Opts:Stem=Up,ArticulationsOnStem|Dur2:8th|Pos2:-5
|Bar
|RestChord|Dur:Whole|Opts:Stem=Down,ArticulationsOnStem|Dur2:Whole|Pos2:5
|RestChord|Dur:Half|Opts:Stem=Down,ArticulationsOnStem|Dur2:Half|Pos2:5
|RestChord|Dur:4th|Opts:Stem=Down,ArticulationsOnStem|Dur2:4th|Pos2:5
|RestChord|Dur:8th|Opts:Stem=Down,ArticulationsOnStem|Dur2:8th|Pos2:5
|RestChord|Dur:16th|Opts:Stem=Down,ArticulationsOnStem|Dur2:16th|Pos2:5
|RestChord|Dur:32nd|Opts:Stem=Down,ArticulationsOnStem|Dur2:32nd|Pos2:5
|RestChord|Dur:64th|Opts:Stem=Down,ArticulationsOnStem|Dur2:64th|Pos2:5
|Bar|Style:Double
|RestChord|Dur:Whole|Opts:Stem=Up,ArticulationsOnStem|Dur2:Whole|Pos2:-1
|RestChord|Dur:Half|Opts:Stem=Up,ArticulationsOnStem|Dur2:Half|Pos2:-1
|RestChord|Dur:Whole|Opts:Stem=Up,ArticulationsOnStem|Dur2:Whole|Pos2:-2
|RestChord|Dur:Half|Opts:Stem=Up,ArticulationsOnStem|Dur2:Half|Pos2:-2
|Bar
!NoteWorthyComposerClip-End