Hey, you know how you can press Q and then slide your nose around the keyboard to randomly shout things like "Build a siege tower!" or "Release arrows!" or something? If you Press Q -> Q -> T your character will say "[T]hank you!" in the chat box. You get 10 letters for the price of three. Or 12 letters if you count opening the chat box and hitting enter.
Take a little time to thank your team when they deserve it.
Reloading a crossbow and a friendly shielder offers you cover? QQT.
Friendly horse rider knocks down a baddie for you to kill? QQT.
That guy just chopped up someone that was sneaking up behind you? QQT.
Let someone know you are thankful for their cooperation. Foster a friendly band of warriors, a camaraderie in this grimmest hour - and the long road to victory will grow several steps shorter.
[T]hank you! Have a nice day.