I just want to tip you off about the very useful iOS notetaking app Drafts which intergrates superbly with Evernote and thereby also Zendone.
Drafts always starts on a blank note, ready to type, when it is launched which is convenient for quick text input. When some text is typed, a left swipe will bring up a list of "actions" that can be applied to the text (see picture below). The built-in actions can for instance email the text, send it as a text message, post it to Facebook or send it to Evernote. It is easy to make custom actions, either from scratch, by modifying the built-in ones or downloading from an online directory.
I've uploaded an action called "Zendone task" to this directory, which displays a dialog box where the area of responsibility can be chosen before the text is sent to Evernote with a hyphen in front of it; ready to become a Zendone task. I've also made dedicated "Task home" and "Task work" actions where the area is added without prompt, to reduce the process by one click.
It costs $9.99, but it's so worth it! Actually, I think this is the app that will tie me to iOS forever.