You do not have to be an experienced traveler to know you won't get a five year visa for a one week course. Common sense tells me this. If anyone gets a DTV for something like that I will apologize.
These are questions you need to ask the Thai Embassy that you will submit your application to. Like everything else that is Thai they all make up their own rules.
Retirement and Spouse Visa have nothing to do with DTV as the DTV is a separate Visa class. That is why you couldn't find anything about retirement or marriage in it.