MusicJohn,
With the example given by Rick and with your own explanation, I suppose, that you could try - inserting a zero-delay breath mark (for the visual effect)
- inserting (hidden) performance style changes - sostenuto seems to be usable since it is somewhere between tenuto and staccato - (for the musical effect)
I admit that it only works for certain instruments like flutes or violins and that it is hardly audible for piano - I suspect the specific piano Attack,Decay,Sustain,Release envelope for obscuring this effect - http://making-music.com/wp-content/uploads/2012/07/Envelopes-ADSR.jpg, but you could give it a try.
Your question (as I understand):
!NoteWorthyComposerClip(2.51,Single)
|PerformanceStyle|Style:Tenuto|Pos:5|Visibility:Never
|Instrument|Name:"Violin"|Patch:40|Trans:0|DynVel:10,30,45,60,75,92,108,127|Pos:10|Wide:Y
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:0
|Note|Dur:4th,Staccato,Slur|Pos:0
|TempoVariance|Style:Breath Mark|Pause:0|Pos:9
|Note|Dur:4th|Pos:0
|Bar
|Note|Dur:4th,Dotted|Pos:2
|Note|Dur:8th|Pos:1
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:-2
!NoteWorthyComposerClip-End
My (approximate) "solution"
!NoteWorthyComposerClip(2.51,Single)
|PerformanceStyle|Style:Tenuto|Pos:-8|Visibility:Never
|Instrument|Name:"Violin"|Patch:40|Trans:0|DynVel:10,30,45,60,75,92,108,127|Pos:10|Wide:Y
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:0
|PerformanceStyle|Style:Sostenuto|Pos:-12|Visibility:Never
|Note|Dur:4th|Pos:0
|TempoVariance|Style:Breath Mark|Pause:0|Pos:9
|PerformanceStyle|Style:Tenuto|Pos:-8|Visibility:Never
|Note|Dur:4th|Pos:0
|Bar
|Note|Dur:4th,Dotted|Pos:2
|Note|Dur:8th|Pos:1
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:-2
!NoteWorthyComposerClip-End
Bart