The issue is how UNICOM get the information or "knowledge". UNICOM are not trained nor permitted to issue traffic information. UNICOM are only permitted to answer questions based upon what a pilot reports NOT what UNICOM observe. UNICOM may not issue information that may be erroneous or misleading. As soon as one aircraft fails to report clear of the circuit or runway then the information that UNICOM hold is no longer valid and so should not be issued as "number in the circuit" (for example).
If you want a service that is permitted to issue this kind of information then you should lobby for AFIS or the return of ATC. Personally it doesn't particularly bother me what sort of service is at AR as it is no longer the manically busy place it used to be
Relate it back to the pilot license...are you saying that a student pilot should be able to carry passengers, just because they appear to be able to handle an aircraft ok?? Should a PPL be able to fly a 747 full of passengers because he has taken off and landed the Microsoft version???
Squawk7700...yes same thing happened to me at a SportAvex at Matamata a couple of years back...