yes, I do (I'm not the same person). I travel in and out almost once a month. Always get 180 days upon each entry. No questions asked. I've used both BKK and DMK. What
Just manually copy and paste whatever letters and/or numbers are written after the two dots on the Place of Issue in your passport. Might be a city name, an authority name, a code, it doesn't matter as long as what you write and what it says matches 100%
it seems for the extension in country, some Immigration offices mandate Thai bank accounts. Which makes no sense, and is neither necessary, as a flight in and out would grant 180 fresh days, anyways.
One thing has nothing to do with the other. If possible, I recommend you use an insurance from your own country, so it'd be easier to claim later (due to language and bank accounts).