If possible, I'd love to be able to try and hide the siblings of my ancestors from view in my family (similar to what they do at familysearch.org) because it gets in the way for me and makes it harder to look for my direct ancestors, particularly when I have an ancestor who had something like 14 children and so of course, I have to go through or skip aside all 14 individuals in order to look at my specific ancestor.
If it was at all possible to hide my non-direct ancestors (the brothers and sisters of my direct ancestors eg my great grandfather's siblings) from sight I would absolutely LOVE that!