the video I posted in this thread answers all of the questions and comes directly from the head consulate who created the visa. There is no requirement of 90 day reporting for DTV holders
60 days exemption. Extend for 30 days 1900baht. Leave country after 90 days...come back in with another 60 days...wash and repeat. Unlimited air and border runs. As long as your TM 30s reflect moving around the country you will not draw attention from immigration