Short follow up question: when in object inspector, how to focus the tree (with the keyboard)? With Alt+m I can navigate to the components filter but a Tab afterwards sends me pack to the properties skipping the component tree.
Another missing feature in the component tree is changing Z-order by drag'n'drop.Drag'n'drop works for changing parent.
I did not find a way to select a specific component in the object inspector with the keyboard only.