There's a new subforum in player communication for the discussion and development of Pal Tahrenor. There's currently a lack of recorded information about Tian Xia and Eyropa, along with the rest of the world. The forum itself is also empty at the moment, but not for long.
If you have an idea for a new city, region, government power, etc., throw the idea up in that forum and I or another staff will review it. If it gets approved, it becomes part of the world and, if necessary, added to the map.
The essence of the rules regarding adding things to the world remain the same, and small, trivial details (for example, that there's a certain blacksmith on a particular street) you may make up in your posts don't need approval, but this way we can record what people come up with and remember to add it to the setting pages.
Also, by the way, there's been a change to forum registration. Instead of a captcha image (that thing where you type in a bunch of letters and numbers) to check for bots, there's now a box in which you need to type the word "ofriyu".