[Brian]

Current workflow I'd suggest on the phone would be to add the project-action to the inbox, and then use the 'move inside existing item' on the action you want to move; that implicitly makes it a project.

Using Jim's example: Make "sell elephant", then move "Call Jim" into "sell elephant"; no need to visit the project interface.

I think this is one of those things that's going to be a lot easier in the context of a full-size keyboard and mousing/dragging interface that the Mac offers. (If folks have suggestions for how it could be improved, of course, we're interested.)

Yes, with a hundred items in the inbox, the above suggestion may not work as well. I think this is a case where doing a review to get those actions out of the inbox, then keeping it under control going forward is probably the best approach. :-)