Since anyone can easily log on and delete the character of their choice without needing to go inside the maps, I don't see the bigger need of this, sure it would always be nice if it existed, but the ingame one should always work and remove as long as you have internet connected.
Personally I just think those who has an issue with overload of characters should just stick to their characters more. I'm not sure where the limit is capped at, is it 40? 50? How often does one really use all of those characters, yet even remember what they were for if they weren't used for a longer period of time. I can understand it's fun to create characters since it's one of the best functions in the game, but I don't understand why not remove those characters within the character creation screen that you do not use, and try to keep it to the characters you do use.
If the limit is a lot lower than what I mentioned above then maybe I might see a bigger understanding for this, but if it is around that limit or even more, then I don't understand why anyone should even have any more characters than that. Keep it nice and tidy, don't flood up the account with characters that never get used, and if you do, there's always just to log on and start removing those you don't need.
In the end, what you might be saving if the character deletion was done fast and quick would be maybe 5 seconds on each character. But then you wouldn't be able to see what character it was as you do inside the actual game, it would be a nifty function for the future, making the site more functional with the game though.