Set sibling detail level
Working with a large map requires you to see the train of thought which led to this node, but often there are many levels of sibling nodes.
In order to navigate properly, you need to be able to set the level of siblings displayed to continue navigating or adding items.
Would like a function to set sibling detail, or even allow a sweeping motion from one node, pop up it's siblings, move to a sibling, it expands further, etc. much like walking down a corridor and opening doors.