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The +omnifocus or -- patterns are for emails you send to yourself to create tasks when you are away from your computer.

If you want to turn any email into a task, you should open the OmniFocus preferences and select the Clippings preferences. At the bottom, install the OmniFocus Mail Clip-o-Tron 3000. Once you do that, you can use the OmniFocus services to turn any email into an action. I have set up command-F2 as my keyboard shortcut for that service.

If that doesn't do what you want, please give more details.