... not true, landscape or portrait is fine. I've always had a mixture of both and just did it again on Thursday. I also just print with normal colour printer onto standard A4 paper.
... it's not that difficult, you just have to time everything right switching from the 90 day to the 1yr extension. I had 1yr multi entries for years doing a rotation schedule up until covid when it wasn't available to return to Thailand. I've been on the 1yr extension ever since. For sure it's not ideal and inconvenient but it's definitely doable and only needs to be done once per year. Just make sure you get a multi entry permit.
You could get the 90 day non O, enter Thailand then get a re-entry permit, leave for your work rotation, return and apply for 1 year extension and when you get the extension, get a multiple re-entry permit then you're free to come and go as you please. There may be a bit of dates juggling while under consideration but it should work out about right if you are on a
To avoid any ambiguity, just get your home registered online and take 5mins to update your TM30 any time you come back from overseas or domestic trips where a hotel would probably registered you.
By the rules, yes, but if you are not filed in Bangkok then don't worry about it but if you stay at a hotel and they file, then you will need to refile back in Pattaya because your Pattaya address will no longer be valid because of the hotel filing.