the immigration office on Lipe gives the same stamps as any other office. It's a bit of a wait once you get there depending on how many ferries arrive and how full they are. It will seem a bit of a gong show but they eventually get everyone stamped in. Expect it to take longer on a weekend.
I'd consider editing your post with respect to the extensions having no charge to saying it's unknown would be more accurate. Historically every extension in Thailand has a charge. It's usually 1900THB but so far the fee involved with the DTV is unknown and is pure speculation. As numerous others have pointed out the MFA is not immigration and doesn't set the rules around extensions.
Anonymous participant what? Many people switch to Non immigrant O visa from a tourist visa in Thailand. There is nothing saying you can only get it in your home country. Are you confusing 2 year OA or OX?
Good of you to take it on and hope it works out! I think it's going to be a hell of a project considering every embassy is different, every situation is also different. Will you leave it open for anyone to update? Keep the core information for each embassy locked and allow people to add specific situations? Keep a section for each embassy for each category? Will it be updated frequently? Will be interesting to see how it works out.
Anonymous participant doesn't matter if you apply under Muay Thai or remote worker you are still considered a tax resident on day 181. How that works or is enforced is unknown.
there is no official period. It's a multiple entry visa so you could probably just turn around and re-enter same day. I say a few days because it doesn't make sense to me to pay to travel to another country, pay for a visa for just a few hours.
I don't think anyone did it yet, some people were asking for one but everyone else said to wait until the visa had been around longer. The embassies and consulates have been constantly changing the requirements and documentation requested so it would be hard to maintain.
it can be extended in country for another 180 days but no one knows how that will work yet. Most people plan on leaving at 180 and coming back after a few days.