[curt.clifton]

Getting the inbox to empty is a key GTD habit. You'll likely see huge benefits in piece of mind if you can develop the habit. (To each his own, of course. But I've found the discussions here useful in both understanding OmniFocus and getting better at doing GTD.)

There has been extensive discussion on the forums about how to handle single tasks. The two most common options are to create a Singletons Project set for parallel execution or to just assign them a Context and choose Edit -> Cleanup. A variant of the first option that I use is to put a separate Singletons project in each of my project folders. (I use project folders for each of my major life roles.)