Anotherthing - absolutely agree. It concerns me just how many pilots do not know what they are asking for when they request a radar service, nor what they can expect from each type of service.
One pilot receiving a RIS from me, on a gin clear day, complained that I had not called a particular contact to him, having already given him traffic information on the four or five contacts I thought were conflicting. (He was flying through a large stream iof gliders on a cross country competition). Having no one else on freq, I then called to him every one of those primary only contacts (about 20), especially the ones that were no confliction. He got the message.
The best (worst?) response I have had to the question "What type of service do you require?" was "Oh, just the usual". He got a FIS. Idiot.
As a footnote, you are correct that RAS is only available if operating IFR.