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It doesn't really make any sense in the original request to try to sort items drawn from both Inbox and projects, or even just multiple projects, so long as you are looking at a project view.

However, if you are only considering items in the Inbox, you might well wish to sort them as you work on processing them into projects. It would be nice if you could just click on the column headers, as you propose, to sort things, but alas, OmniFocus doesn't support that. You can use the Edit->Sort option (or right-click and choose Sort from the popup menu) however without much concern that you are disturbing the sequencing of actions in your projects because you haven't processed them yet. I was able to assign a keyboard shortcut to one of them via the Keyboard section in System Preferences and use it to sort a handful of selected actions in the Inbox.