Hi,
Thank you for the feedback.
Forward looking, we will support more advanced interactions which will allow to implement the user case you mentioned with the logo.
Currently you can create a new header by duplicating the existing header either on stage or in the masters panel. Setting a header as Fixed is only possible if that section is most top across all breakpoints. Once you make sure this condition is kept then the Fixed will be enabled and so will the scroll effects.
Na’ama