Paul De Graaf Yes. IDP. It is a permit and definitely not a licence. It does not matter how long you have been calling it a licence, that is still incorrect. It remains a permit and will never be a licence.\
Yes. Visa exempt followed by an extension is meant to allow tourists to holiday in Thailand. If you desire to stay in Thailand for a longer period then you are no longer a tourist and if you do not wish to fall foul of Immigration, then you need to obtain a visa appropriate to your reason for staying.