It is an interesting topic for me. I spent one year in Thailand in 2005. I collected all requirement document to get Thai PPC. But, I have to wait for the requirement letter from CIC. In fact, I think that I can apply Thai PCC without it, but I am worry :-\
I think that I can ask my friend who is currently working in Thailand to apply and get the result for me. I do hope that Thai policeman are OK with this.
Applying Thai PCC from Canada is quite complicated, since Thai police need a self-return envelope to send back to the applicant. It is tricky since, I cannot order DHL or EMS for such service. I have to wait about more than month to get the result. I currently live in Canada. In addition, the Thai PPC is the last requirement for my PR application. I know that I have to do, but I cannot process. :'(