Inmigration is coming to Pai this wednesday, come and visit us and do your extension here, hehe... Sounds a little bit strange, there are many tourist coming with visa exemption entry or SETV, and many of them are travelling around the country two days here, two days there and so, and they get extensions without any problem. So, for example, if you are a tourist that arrive just now to Chiang Mai, check in a hotel and go tomorrow to Promenade for your extension... do you need the TM30? may be after tomorrow you follow your travel to Chiang Rai or other places. I think they ask the TM30 for other kind of visas, but not tourist extensions... but who knows, this is Thailand.
, in our last extensions we never show any TM30, at least at Mae HongSon office, just write the correct adress of our house, no worries about that. They don't ask that for tourist visa extensions.