Hi @leschtroumpf,
Thank you for your great feedback. 
Unfortunately, BP Custom Menu is not supported by our theme. I took the liberty to move your topic to the Feature Requests forum, in which we store and discuss integration or feature addition with our community.
We will implement this feature if other community members grow interest for it and upvote your request.
We’ll keep you informed. Thank you very much for contributing to your theme!
Best regards,