Thanks Evan for this. A useful macro – For those that try to follow it, you will need to click into the ‘click to record a keystroke’ window when building your perspective in OmniFocus and then to type the ctrl-alt-cmd-s. The keystroke isn’t shown in the screenshot of the perspective.
I hope that one of these days the omni group will get round to making the search field a search field rather than a ‘filter’ of the existing actions – then workarounds like this won’t be needed.