There is a way to put coursorein the middle of a frase in the chat (other then arrow keys). Just need to hold controll and klick where ever you please.
Anyway, just whanted to share this, since I never heared about it. And it's realy anoing to use arowkeeys when you need to change something in a middle of a frase.
I think it's new for C4. I've also noticed that you can highlight entire sentences now, where you couldn't before. It was so annoying, if you had typed out nearly a whole sentence and then someone said something that negated it, you'd have to backspace all the way back. Now you can just highlight and press backspace once and POOF, it's gone. (I've done that on accident a couple of times. :o)