One workaround is to use Templates. Change your instruments, and their parameters and then save that as Combo Template 1 (or whatever will help you know what that combo is).

When you want to apply that combo to "your song"... copy and paste your chord sheet from "your song" onto the Template, and save that as "your song".

You still have to set form... tags, endings, intros, or any other special info.

But if your template has the form already set, you can minimize that.
(Standard 32 bar tunes for example, can fit right in to your template and be ready to go.)

I'm using that method, since PG hasn't given the Mac version the ability to save combos.