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You want your task to be red? Just assign it a due date of, oh, yesterday :-)

No, there isn't any color-coding available except based on the status. Open up the OmniFocus preferences and click on the Style tab; you'll get a nice color coded list.

I assume the request for red means you want to mark something as urgent or higher priority; why not just use the flag feature for that, at least until you are more familiar with the system?