prevent chat window from stealing focus; possible?

[Nivm]

Why would those things being forbidden give players an unfair advantage? Your post seems helpful, but I don't know how to parse it.

[LigH]

The player who does not cheat needs to run in curves to follow the road, or up and down to climb the hills. That takes much time and stamina.

The player who cheats makes a flat line between portals and does not need to take curves or hills -- he can run straight, so he loses less time and stamina.

How can you believe that such an advantage from cheating is not unfair?!

[Nivm]

 Out of four things, not what I was referring to. The first statement read like "modifications [...] are forbidden"→"which gives some players an unfair advantage", which isn't what you meant. I still can't find where the subject of "are offensive and obviously violating laws". Shouldn't that sentence be:
"I believe we can agree that modifications of art or software are forbidden because they can give players an unfair advantage (cheating), can be offensive, or can violate laws."

 I think I understand the next two sentences now. I was confused because "acceptance" and "being accepted" are also different things, and purpose doesn't make a difference if violates a contract or law. Tolerance is different from acceptance because if you tolerate the above mods, that means you want to get rid of them, but know you should not. While acceptance is different from "being accepted" because if you have acceptance towards the mods, you don't actually want to get rid of them.
 So now that I know, what's keeping you from banning all such mods if you want to?

[LigH]

The topic "modifications" is rather large and has many corners, which you seem to try to discuss in only one sentence. That's hardly possible. There are many places where modifications could be applied, as well as many purposes why one would make modifications. There are many examples of modifications which the license does not allow: software cheats (adding features to the client which expose interna), resource cheats (modifying data files to gain advantages over other players), offensive art modifications (e.g. "nude patches") ... but it is not easy to declare one rule to prohibit them all in a way which does not exclude all kind of creativity from contributors.

Very simplified, you may probably make a rule in a range between the strict and the loose limit:

a) It is forbidden to use any kind of modified software or art to play on official game servers, because it might give unfair advantage, might be offensive or might break laws.

b) It is forbidden to use such kind of modified software or art to play on official game servers which gives unfair advantage, is offensive or breaks laws.

At least in case of art, rule a) is not enforced, as you can see from GUI skin mods.

Anyway - we are already hopelessly 

[Nivm]

 Your skill in missing the point has increased to level XII. My main problem is grammar and terminology; I understand well the problems with constructing rules for altering the client, but I couldn't read what you wrote accurately. Kinda like your last sentence "[...]already hopelessly [noun?]"; that adjective should be describe something.
 Oh, and "all such mods" was to refer to the ones/kinds Aiwendil posted. The same ones you had referred to.

[LigH]

You missed the image after the last sentence: "... hopelessly [off-topic!]"

And the chance of misunderstanding increases both with the time between now and the previous reply, as well as with the amount and complexity of text one has to read again to remember the last topic.