1. There is certificate of residence, in Thai not the one that immigration issue but the house owner, plus blue book and thier ID, you get if from immigration. Very simple. Maybe its that there talking about.
Moderate chance of 30 days. You need to be convincing to the Immigration officer and have much tourist stuff ready as you can, like return flight to your home country, hotel booked. 20kthb
Yes people do use this route, but clearly it applies to dental procedures like implants, orthodontics though routine cleanings or checkups typically do not.
On what basis was the non o issued? Marriage or retirement? The TM7 is one form you need, but depending on the type of visa ext your on will depend what you need. Also visit your immigration they can give you the requirements and you can pick up other forms.