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I recently reported this as a "bug"; it arises out of the differences between a "single action" and a "project". There's no way to put a single action on hold; assigning a "future start date" to them isn't putting it on hold, it's putting it into a Pending state, which is different (pending comes back on the date; on hold stays away until I say otherwise).

Please please please treat single actions like first class citizens.

(I know, I know, a gazillion other threads on the whole single-aren't-projects already exist. Sorry. It's a pet peeve I have with OmniFocus.)