Thank you, I will definitely try to do that but I'll only have a chance to do so after about 2 months because I am using this Macbook for work on a daily basis and I would need to leave it there for some time. I really wonder what they will tell me, I'll post it here after I went. By the way there are some screen flickers as well, but I can live with that. There are occasional horizontal flashes sometimes. But anyway, I hope the keyboard can get fixed without them breaking any other stuff.
Noooo!! Tell them the screen issue too and that it really bothers you. The keyboard issue my require a bottom half replacement, a screen issue may require a top half replacement. If you are really lucky they might just give you the new 16" instead!
I took my keyboard yesterday and showed the 'triage' guy the pictutre of my keys. He said he never saw it before and he would have to pencil me in to diagnose it before they woudl konw the fix. Like you I can't really give up the machine, however I will go back some quieter time and try again.