In SmartShape > Smart Shape Options the only customization option for 8va/15ma signs is starting symbol. It is not possible for example to customize continuation (post system break) symbol or to fine tune extension line position in relation to octave sign. As a workaround one can create octave sign as custom line which provides greater customization flexibility. However such a way has its own drawbacks:
- It is not possible to assign custom line to standard 8va/15ma icon on Smart Shape panel. That reduces user experience and opens a possibility for mistake (the user may forget about custom octave sign and use standard one occasionally).
- Custom octave sign has no playback effect (workaround: add hidden standard octave sign).
Remove 8va/15ma signs from SmartShape > Smart Shape Options > Symbols and add them to SmartShape > Smart Shape Options > Smart Lines drop-down box to allow customization level comparable to glissandi/bends/slides.