Retirement visas don't count towards permanent residency. Even the LTR and privilege visas don't. In fact, neither does any visa, unless you've been in Thailand on unbroken 3 year extensions of stay on a non-O, non-B or other eligible visa class with a work permit earning 80,000 Baht a month EVERY month for 3 years (reduced to 40,000 if you're married to a Thai national).
The Yangon appointment system was being abused by agents, hence why they shortened it to 14 days and removed the possibility of canceling until after the appointment date has passed.
An IDP is valid for either 1 year or 3 years, depending on whether it covers the 1926, 1949 or 1968 UN agreements. There is no 5 year IDP. If you see one, it's a scam.
For driver's licenses, they're not very strict (for the most part). I think you could apply almost anywhere with a residence certificate (ideally, covering the province you're applying in).
That doesn't make any sense. I've never been asked for an onward ticket when coming in on a 12 month multiple entry B or O visa and those only give you 90 day stays.