Sorry if I'm late to the party, but I think I'll spill my 2 cents anyway here. I think it might be useful for you.
I believe those Turkish alphabet are produced by typing through your keyboard, am I right?
If that is the case, my educated guess will be because "Notepad++ don't understand Turkish keyboard."
You might want to resort on 3rd-party character-list application such as Windows built-in Character Map or similar online services. (I don't know the counterpart for Mac, tho. Sorry, can't provide any suggestions for that)
This way, I think you should be able to use "ş,ğ,ç,ö,ü" while waiting for CS-IDE's better feature.