[brab]

The way I've been dealing with these (I need (maybe) to call back later) is to change the start date of the event. I call, I don't talk to the person or they promise to call me back, so I just click on "start date" and type "1w" to remember it next week. I found this was sufficient in many cases, fairly fast (no need to enter a new next action), and it works with what is currently available ;-)