I see the point elgato is trying to raise. I also understand how difficult it is to qualify roleplay. If you can't quantify a rule then it will lead to admins' subjective point of view of what is good roleplay.
And people already raised a point that while this is an English speaking server a very large part of the players have hard time coming up with a response in understandable English in the 3 seconds that is usually given in the server before sending them to kingdom to come. And Igiss with the admin team has said time and again that the server will stay public and the more players the better. So trying to make the game to the point of it being un-playable for many players is not fair.
Good RP skills inevitably require a good command of the English language. And you just can't write a rule about the quality of the English you must have. What makes this discussion even harder is the level of the language people use here and in-game. I have to read and re-read what xoria and you are arguing there so eloquently and I have to say that I'm rather well versed in your native language. Don't get me wrong, I truly enjoy reading well formed and written text instead of one liners with abbreviations and such. But arguing your case should not be based on the eloquence of your words.
All things combined I think it's impossible to qualify someone's RP and put it in a rule.
In page 2 of this thread someone said something that caught my attention. How about answer - reply kind of approach?
If it where me calling the shots I'd put an ADMIN NOTICE something like this:
You are required to have "/setmgs 1 I'll give you #t 10 seconds to respond or halt before I open fire."
But that's not workable either, so what's the solution? There is none really.
I consider the bread and butter of the server to be the "one liner RPers" and good RP experience like a good dessert. Play with everybody, but have the great RP sessions with those you know are capable of giving you the satisfaction that makes you log in tomorrow and day after that. And you good RPers, don't develop an attitude towards those that have hard time expressing their thoughts in English. Your efforts at RP here as well in game can be enjoyed also by them. Usually people understand more than they can they can express. And well written English RP gives them a good role model to strive towards.