Sorry for the late response. There is a problem with extraction of the data for this release. Working on it.

No. They're not marked with dates in anyway. So unless I track it down manually with each update, like I do with items, there is no way to say, when something was added to the game.

I can't do it backwards. For the future updates it's possible, but not for the previous ones.

You can already see this info for Items and Quests. Check the "Added in Patch" submenus in those sections.
The game is sadly almost dead and very few people are coming to the site these days, which makes further improvements of it kind useless.

Удалил. Спасибо за ваши картинки!

Done.

Which region is that?

Thanks for the news. I'll try to update it.

Thanks for the report.
I'm having problems extracting the data from the recent version of the game.
When my tool will be fixed, I'll update the site.

Sorry about the delay. Done.