On 9 Oct 2013, at 21:32, Ross Ahmed wrote:

I¹ve just noticed that its possible to fold TODOs using the little arrows in the margins. Is it possible to fold all TODOs in a document using a keyboard shortcut?

In what context are TODOs foldable? Normally only multi-line constructs are foldable, in that case, you can toggle all foldings at a given (nesting) level using the View → Toggle Foldings At Level submenu, actions there are bound to ⌥⌘1-n.