It's nearly impossible to use the editor's toolbar on an iPad, in case you have a selection on the first line text inside the editor. You cannot reach the buttons below anymore. It's hard to explain, but take a look at this screenshot:
Currently I add some extra newlines before the first line of text, then hit the bold, link, code or image button, and then remove the newlines. Since typing on a iPad already sucks, I'd love to see a workaround for this.