option up and down, moves between siblings at the same level (I wish iThoughtsX had implemented this)
up and down keys moves 'sensibly' within the hierarchy - iThoughtsX moves weirdly IMO. (especially if you have manipulated the structure a lot, the internal model did not always reflect the visual layout)
Ok, I didn't realise how much this annoyed me until I implemented it properly. Now I'm extra annoyed in iThoughtsX when it doesnt work the way mine is implemented.
Search 'closes' unfolded nodes as you step through the results rather than leaving them all open