@Tony ********
I can say with 100% certainty that a proof of TM.30 is NOT required in Bangkok for ANY type of extension of stay <- AT THIS TIME (and by that I mean as of thursday ;) )..
I had friends get an ED, an O-retirement, a re-entry permit & a 30 day visa exempt extensions out there and none of them were asked for a TM.30 receipt.. Nor is it required for 90 day reports either.