Hi Michael,
Unfortunately it's not possible to hardcode the manual nav. Even if you could, there's no reason you'd want to -- since it relies on being edited to choose the pages, if you hardcoded it it would never show anything (because hardcoded blocks can't be edited).
If you want to hardcode a manual menu, could you just hardcode the menu HTML directly into your theme template?

Hi Jordan,
you're absolutely right, seems i have been thinking in a circle - that was stupid, since i can always hardcode any custom navigation links i want on any page without an add-on...
Sorry for that question, and thank you for your answer!

Cheers,
Michael

No need to be sorry -- I run my mind in circles sometimes as well, happens to the best of us (well, the more "thoughtful" ones perhaps).