First, My English is not well-skilled, so there're some points you would be difficult to understand.
There are a lot people to enjoy Dungeon and Dragon Online, and That includes non-English users(not British or American). Especially, You should have an experience to meet players who might be which one of Chinese, Japanese or Korean and so on like Russian... They don't use English generally. But most of them are incapable of chatting with their own language, because the game doesn't show certain characters as the font in the game has not the characters of those languages except for English, Greek, Russian(Cyrillic). It's really unfair. why not us?
I'm a Korean. You can see I can do well as English with no problem. yes, I'm no problem with you guys to converse. but I have many problem to converse with Koreans, my country buddies. We can HARDLY converse each other as there's no characters to express our language well. many people from other countries(Like Chinese, Japanese) have also same problem to this tragedy with being unconversational. This problem made also other problem that people who was troubled in this gonna leave from the game. so I lost some of my friends because of this, They left the game.
This problem is not from input system, It's because of font in the game. We can type as our languages well, but typed word becomes "??????." you can see a screenshot below... I don't think putting new characters to the font doesn't cost terribly, but this would make new people who have potentials to purchase the game. at least you can have that reason to do this.
So, Turbine. Could you please add the font into the game for us? Adding new characters into current font would not be high cost to do. even you made Cyrillic of Russian and Greek Letters. It's unfair.
or by the other word, can you make us happy as the token of that we didn't not give up your game? we have royalties for your game... Please, font please.
I put some Q&A below, as I might forget to write something important in that word above.
 I can't understand what problem you have.
See the screenshot below.
*I changed font size to 16 from 14, to make the legibility of that. Default size is 14.
*I can't change or add font by that function. only developers can do that.
as you can see, everything which is not in the font appears as ??????. but we can type at least.
while Greek and Russian have no problem... :/
 You can use Voice chat by the in-game system or MUMBLE.
That's not a proper solution. It forces everyone to have a microphone to voice, and It's not that everyone must have a microphone. have you a microphone always?
Plus, There's a problem to hear something like me. It's personal problem, but It would be a reason.
 They should require many human resource or companial capital to make them able to chat.
Yes, It's true that They'd take the cost to do. but I don't think the cost of doing that is not really "MANY." It's just to put new characters into the current game font. They don't need to change their character input system, It works already well for every character.
 They should change their character input system.
It's not the problem about input system. It's about the font. Cyrillic(of Russian) and Greek letters are in the game font already, even Turbine never offered any service for Russia and Greek directly.
 Exactly, What's that word of "We" you wrote?
We -Korean, Chinese and Japanese- are at same position about this problem. We took the game service once, but that game service was gone long time ago. even Turbine didn't offer service directly, but did it by national localizing to permit the publishers. We had our own national servers, and we moved to English Servers after our national servers gone because the publishers was incapable to operate the game service.
 Why should Turbine do that for you?
Yeah, They don't have any must to do that. It's true. We're the weak. even what I'm doing(like writing this) is same to cry to the midair. They would not add the new characters into the font even if we complained about this. but It's a serious problem of expression which ppl should do generally without trouble, and We'd get that problem due to the lack of the font. We want at least they'd solve this unbelievable tradegy.
By the way, This would bring more players who has a potential to purchase the game. This can make a great effect by costing less. at least this can be a reason.
 So what's the solution?
I wrote it already, will write it again here. Adding the unadded characters into the current font of the game.
 You could write this on suggestion&idea forum.
Generally, developers don't answer anything of that forum. so, getting their answer easily is writing this on general board, where there's a high chance that developers would remain an answer.
 I think There aren't many foreigners enough to do this.
They don't use the forum well, but I hope they would make many posts on this, to prove that work is worth.
P.S. New forum system made my nickname worse.