@Greg *******
there are official publications, what is permitted is not up to chance (although some agencies make their own decisions due to ignorance of the Immigration Act and the official publications).
Royal gazzette Publication for foreigners staying for special purposes, and then
Thai Immigration Act of 1979, sections 34, 35, 37, 38 and 41
Almost all questions asked in this group could simply be answered by reviewing the publication (it's very short), and then EMAILING the consulate location. Email provides a chain of proof