You can change the templates provided in NoteWorthy Composer and save them as new templates:
Open the rhythm that you want to change
Change the template as you want
File: Save As
Save file under Template, Rhythm as whatever name you want
Now you have a new template the way you want it. When you enter Ctrl+N, you template will be there.
You can also create a template from new:
Create your song file
File: Save As
Save under Template, Rhythm or Custom
Attention: Windows Vista Users
For Windows Vista, in order to modify the Template Files that are located in the NoteWorthy Composer Program Files area, you must first run NoteWorthy Composer as an Administrator. You can do this by right clicking on the NoteWorthy Composer program icon, then selecting the "Run as administrator" menu command, as shown below: