If you have the finances required for an extention, you can do so at your local immigration. You can get a 1 year extension based on supporting a thai spouse if you have the finances required
Yea, sometimes they take it some times they dont. They used to take it back in the day no problems, didn't even need to be pristine. But these days it is hit or miss with the officers.
- there are more reqs when getting it at immigration and some of which, some people cannot or do not have, therefore that's why some need to get it at an "easy" consulate such as savannakhet.