Dick:
As you probably know, under the proven FAA system there are no restrictions placed on UNICOMs. It is a non-prescriptive system which is entirely there to improve safety
Relevant extracts from the FAA's Aeronautical Information Manual for your info
1. UNICOM is a nongovernment air/ground radio communication station which may provide airport information at public use airports where there is no tower or FSS.
2. On pilot request, UNICOM stations may provide pilots with weather information, wind direction, the recommended runway, or other necessary information. If the UNICOM frequency is designated as the CTAF, it will be identified in appropriate aeronautical publications.
It is interesting to note that information provided by a UNICOM can only be on pilot request and, significantly, there is no mention of traffic information. That sounds fairly prescriptive to me.
My highlighting of the quote for emphasis only.