Feature request - optional 8ve

I write music for amateur orchestras, I often need optional 8ve.

It would be usefull to have have possibility to add “opt.” or “ad lib” as before 8ve.

I’m currently using shift-x text as workaround

I concur!

You can absolutely do this as a playing technique. Such indications don’t usually include lines, as they’re made clear by their context or by a loco indication.