+1 to first two games, the last two i have doubts about.
The third: It has been tried before many times, but to no avail. The T and CT always go into a rumble since the T can have an advantage over the CT if they want to. (CT left-clicks, T right, T wins instantly since no escaping for anyone) which will usually always ruin the entire game for everyone and it won't be played the same again. Yes some people want to play the game but half of the Ts usually love to be dicks and ruin the fun for CTs (if any fun at all) even if it costs their lives.
The fourth: It will be rather difficult in many ways, 1: having enough ammo. 2: actually figuring out the sizes of the letters (if it's not right it will look like fsdfsdf if you are trying to say peanuts.) Regardless, it can work with simpler words (i.e. LOL, etc.) 2: Shaping the picture, etc.
Basically:
1: +1
2: +1
3: -1
4: +/-0