[SpiralOcean]

Here's another thing I do for waiting for, I create a child of the action and assign it a waiting for context.

Example:
-Create Screencast of OmniFocus workflow
--email omnifocus support about setting up a screencast

After sending the email, I create a child that says waiting for response, and assign it a future start date in the waiting for context.

This hides the email action in my email context, and hides the waiting for action until the start date is reached (tomorrow), at which point I go through waiting for and either bug them again by sending another email, or change the start date to the future.