Is there a mod which makes regions outside the gamespace more finished looking? I'd like to put a town way out in the middle of nowhere but the landscape beyond the invisible boundaries (disabled in the .INI) is barren and in some places has enormous voids in the ground.

Well, there's a couple of mods that make Elsweyr and Valenwood actually be Elsweyr and Valenwood. You might find a location in those areas you like.

Well, there's http://www.gamesas.com/index.php?/topic/1073491-wiprelz-under-the-sign-of-the-dragon-tamriel-heightmaps/
http://www.gamesas.com/index.php?/topic/1080432-under-the-sign-of-the-dragon-tamriel-landscapes/

Now I feel bad for not looking at the topics listed on the first page :[