can i apply for thai visa by mail?or someone else can submit my documents for me?

i am pakistani passport holder studying in china.i wish to visit thailand in january.the city where i am stying( urumqi xinjiang)is very far from thai embassy beijing so i want to know which one is the easy way to apply instead of i go to embassy by myself.
1=can i mail my all documents to thai embassy and i can get it or not?
2=my friend he living in bejing he can submit my application ?
3=is this possible i can apply at any thai consulate all over the china which is near to my city or i should need to go beijing.this is my sencond time for application.before i have been to thailand.and how long time it will take to get it?