It's something we'd like to add to the other two editions at some point, but we don't have an ETA on when that might happen. At the moment, we're working on
updating OmniFocus for Mac - it's been sidelined for a while in favor of the new features we've added to the iPhone edition. (Geofencing and Siri support, for example.)
(Adding this request to the development database, though, so the rest of the team will know you'd like to see us add this. Thanks!)