Set Focus on any line
When "browsing" through data along a tree dimension and "drilling down" you repeatedly need to set the focus on parts of the tree, i.e. set a specific element as root of the tree segement you are viewing.
This is a killer feature that is really missing to actually analyze data dynamically. It should be available through a button in the top ribbon as well es the context menu.
It would fit nicely next to "change column/row" - and I am surprised it is not included yet.
Currently you can somehow get close to this by switching the same element back and forth, but that's not really practical.