[Brian]

bbebop, we're using the calendar events strictly as a way to get notifications; we don't intend to rely on this as a long-term solution. When/if Apple adds on-phone notification options, we're likely to replace this feature with them.

Basically, the intended workflow is to jump back to OmniFocus and initiate the call from there. If you add the phone number to the note field of the action, you'll be able to do this.