[davidC]

To bas42:
It seems to me you are talking about two distinct kinds of waiting.
The first kind is "waiting for yourself to delegate" some responsability to another.
The second kind is "waiting for the person to get back to you".
Seems to me that you need two categories:
@delegate and
@waiting (to hear back)
When you have delegated some task you need to then place a reminder in @waiting that the ball is in that person's hands. You might alternatively or additionally set a tickler if the person doesn't get back by a certain date.