Now that I am using Leo's spell checker, I find that I would like to have a minor change in how it works. Currently when I click on "Find" in the Spell tab, if there are no errors in the current node, the spell checker will walk through the nodes until it finds one. That's not what I want, because it's very distracting to suddenly have your node swapped out from under you.
I suggest that the Spell tab should have a selection list like the Nav tab does, so that you can choose to spellcheck just the current node, an entire subtree, a file, or the whole outline.