Find and filter dialogue = Hierarchy option should show whatever you used last instead of always reverting to unchecking "First Level only".  

If you're doing many consecutive searches it gets tiresome having to check it each time.  Worse, is forgetting to check it, implementing a massive search that often crashes the program (for me).

I think "last used" default is implemented for other dialogues and should be used here, too, I think.

Actually, it's implemented in the other parts of the same dialogue.  Only the Hierarchy is re-set each time.