[Arild]

I can add that my solution is to keep "Waiting for" on hold since I have a "Waiting for"- perspective that is very useful and I check that regularly. I use due dates to give me a warning as well.
Additionally, I have sub contexts under "Waiting for" with the names of the people I most interact/collaborate with.
I don't want to have this in "Next Action" since that could easily lead me to untimely respond to/nag about something other people are supposed to do within a given time frame.