Hey DTV-Homies,
just a quick update: A feew weeks ago I asked the group if I can extend my DTV - not under the DTV scheme but under the normal tourist visa scheme - for 7 days because I made a mistake while rescheduling my cancelled Etihad flights.
So, if anybody is in a similar situation: Yes, this is possible!
I first went to Chiang Mai Immigration at Central Festival and they weren't able to handle it. But the main office next to Chiang Mai airport extended my stay for 7 days without asking any questions.
On the form, I chose the option to extend due to the war in the middle East. I had prepared all documents about my Etihad flight being cancelled, but nobody asked. I just paid the 1.900 baht and got my new stamp.