I often wondered if I fly into a neighboring country, cross the border illegally, and just stay in Thailand. When I needed to leave I could back to the other country and get in trouble for overstay, or go to a different country illegally and claim I didn't get stamped.
On occasion people look at that paper. They maybe could look in a computer or maybe not. My experience here in Thailand has been pretty good. My secret - don't be a pain in the arse. My advice to you, print it out, smile.
I used my US driver's license and IDP to rent a car. I have never needed a license otherwise. I have paid a several fines/bribes for riding a motorcycle.
I had one of those.. Never really seem to do any good. Police dont really check, too much. Depending where you are the police pull you over for one of two reasons; Bribe money or as a legit public service. Bribe money ranges from 10$US to 30$US. When its bribe money its usually routine, you'll know where and when they run those stops. When its a public service, its usually to remind you to wear a helmet.
If you want to avoid hassle with the police, wear a helmet.
It will make more sense once you are here.
If memory serves me correctly, Thailand is not party to the treaty reference in your document. I think they are not party to any international driving treaty. I think they maybe party to some agreement for ASEAN, but that's probably not likely applicable to you.
Just a follow-up. Yesterday I showed up at the Phuket immigration, in Phuket town. Made copies of several pages in my passport, filled out some forms, went to the main window. They gave me some other forms to fill out, I did, and went back to the window. They gave me a number and I waited for about 30 minutes. I was called to a different window and the person helping me told me to get some more passport pages copied. I came back, signed some papers gave them some money. I was told come back next day.
Next day (today) I went back they gave me a passport with a stamp good until 26 February.. That would be 60 days from my previous stamp.
I don't think I have to wait for the thing to be completed. I think it was one-stop, well two stops, drop-off and pick-up.
I am not sure why agents want 7000+ to do this paperwork.