Gordon Murray will put the gear shift of his new hyper car on the right as most people are righthanded. However:
????If you learned to drive a manual using you left hand and spent many years doing so and now drive a manual in Thailand you maybe smarter, more creative et al.
If one lives upcountry and the immigration office is close and usually empty then return visits are easy, if you are "missing" something. If one needs to visit a busy overcrowded office such as in Bangkok then using an agent saves a day of reading and getting there before the office opens.