1.) If someone sends me a PM inside a thread, the URL of thread will be included in the PM. It will be much if you do a lot of BST 2.) Some kind of spell check function? My English sucks so I if want to make sure my spelling is right, I need to copy my message to MS Words first then paste it back. If there a spell check function in the reply box, it will be nice(The best would be something like digg, it do spell check in real time) oh god, i even got the title wrong(wishes)....
Spell checking will never be server-side here... too much load for something that IMO should be done on the client side.
I am also agree with ahkip regarding first suggestion. So when we send PM to anyone inside his/her thread no need to mention thread details there. It's really helpful if possible for shawn.
That will just make it more confusing People like to give moire suggestions rather than thinking how hard it is to implement it