Would it not be possible for the mods, who clearly know more than the rest of us, to pin a factsheet stating/repeating quite clearly:

a. What are the available visas and extensions and exemptions and for whom: also.. where to get them, documentation required etc.

b.The rules governing the use of those visas

Obviously I think, too, that Thai Immigration should do this too

??

Published information can be found here: http://www.thaivisa.com/forum/topic/523810-important-visa-information/

and the various threads in there.