RAT5,
Isn't it the case that ATC ask you what they would like you to do and you decide how to achieve it, or if it's even possible.
You know that, I know that.
I was just giving a real example of when an ATC request has put me close to min maneuver speed in cruise. In fact, I don't find the RTA function particularly good anyway on the 737. It often starts with a very low cruise speed and progressively speeds up. Even with all cruise and descent winds loaded.