Greg Bewick. You could try applying for your Thailand Pass before you leave Thailand? I don't know how that would work, or even if it would work, but someone should give it a go. It might make a "border bounce" a possibility for those who need one
Diana Kim Sangkharat. I'm a big supporter of the mail-in. A five minute stroll to my closest post office, copying & EMS postage around 80 baht. Against the hike out to CW and writing off the whole day. It's a no-brainer, but as Benjamin has said, it's only for Bangkok.