An Australian, married in Australia to a Thai, now living in the Northeast, holder of an Non-O-Visa was told by an immigration officer in Mukda Han that he could as a first-time applicant extend his present visa for another year based on his marriage and showing 40K income. The same officer also told him that with this extension he would even not have to report every 90 days and be forced to do those 90 day borderruns.

I am not so sure about borderruns after such extending, but do know that actually the only two visas where there are no borderruns required were the Non-O-Visa based on Retirement and the Non-O-Visa based on Work Permit.

Thanks for clarification.

A 1 year extention of his visa is exactly that, he will not be required to leave the country. He will, however, have to report his address every 90 days to the nearest immigration office.

Should he want to leave the country while on such an extention he will have to get a re-entry permit to be allowed back in on the same extention.

As said it is not limited to the two types of extension you mentioned. Extensions for education, business, family and retirement all require no crossing of borders or personal reporting to immigration but any stay of more than 90 days without leaving Thailand does require that you report your address with a TM.47 form.