Then you have some version of NWC2 that I lack.
This is nearly identical to Hirkowi's ex. 1)
!NoteWorthyComposerClip(2.0,Single)
|Clef|Type:Bass
|Key|Signature:C|Visibility:Never
|TimeSig|Signature:4/4
|Note|Dur:8th|Pos:1|Opts:Stem=Down,Beam=First
|Note|Dur:16th|Pos:1|Opts:Stem=Down,Beam
|Note|Dur:16th|Pos:1|Opts:Stem=Down,Beam=End
|Note|Dur:16th|Pos:1|Opts:Stem=Down,Beam=First
|Note|Dur:16th|Pos:1|Opts:Stem=Down,Beam
|Note|Dur:16th|Pos:1|Opts:Stem=Down,Beam
|Note|Dur:16th|Pos:1|Opts:Stem=Down,Beam=End
|Note|Dur:16th|Pos:1|Opts:Stem=Down,Beam=First
|Note|Dur:8th|Pos:1|Opts:Stem=Down,Beam
|Note|Dur:16th|Pos:1|Opts:Stem=Down,Beam=End
|Note|Dur:8th,Triplet=First|Pos:1|Opts:Stem=Down,Beam=First
|Note|Dur:8th,Triplet|Pos:1|Opts:Stem=Down,Beam
|Note|Dur:8th,Triplet=End|Pos:1|Opts:Stem=Down,Beam=End
|Bar
|Note|Dur:16th|Pos:1|Opts:Stem=Down,Beam=First
|Note|Dur:16th|Pos:1|Opts:Stem=Down,Beam
|Note|Dur:16th|Pos:1|Opts:Stem=Down,Beam
|Note|Dur:16th|Pos:1|Opts:Stem=Down,Beam=End
|Note|Dur:16th|Pos:1|Opts:Stem=Down,Beam=First
|Note|Dur:16th|Pos:1|Opts:Stem=Down,Beam
|Note|Dur:16th|Pos:1|Opts:Stem=Down,Beam
|Note|Dur:16th|Pos:1|Opts:Stem=Down,Beam=End
|Note|Dur:16th|Pos:1|Opts:Stem=Down,Beam=First
|Note|Dur:16th|Pos:1|Opts:Stem=Down,Beam
|Note|Dur:16th|Pos:1|Opts:Stem=Down,Beam
|Note|Dur:16th|Pos:1|Opts:Stem=Down,Beam=End
|Note|Dur:16th|Pos:1
|Rest|Dur:16th
|Rest|Dur:16th
|Rest|Dur:16th
|Bar
!NoteWorthyComposerClip-End
ex. 2) exposes a problem in NWC2: the triplets are spaced unevenly.
NWC's proportional spacing routine only affects whole, half and quarter notes.
I do not understand what you want in ex. 3)
The 16th triplet group should be the tightest, followed by the 16ths, 8th triplets, and the the 8ths.
I do not expect to see this any time soon ...
Yes, it would be wonderful if the range for Extra Note Spacing: was -1 to 3 and allowed increments of at least 1/10th. For ex. 4) you could set the 16th notes to -0.2