So, are you saying you want an easy way to move something you've already clipped into OmniFocus over to OmniOutliner? Or are you asking for a clipping facility in OmniOutliner (which already exists, though is not as nice as the OF one)?
If we are talking about the former, how would you expect it to work? Select a row (or multiple rows) in OmniFocus, invoke the mechanism, what happens on the OmniOutliner end? Do those rows show up in the current default clipping file, as top level rows in the frontmost OO document, as rows at the current insertion point in the frontmost OO document, or what?
Any feature request you want noticed by Omni should also be sent in via Help->Send Feedback or email to <product>@omnigroup.com so that it gets in the development database. There isn't any guarantee that a forum post will be seen or acted upon, though they can be useful for building broader support for a request.