[Zokkel]

Also, I am encountering an issue where I go into Skin Settings > Setup the Aeon Nox main menu > Custom X, and I try Default select action, but when I hit enter on "Favorites" to choose one of my favorites, nothing happens. Thanks for any help

1) Have the same issue when customizing submenus: there is nothing in the favourites link menu... I think there might be a bug here. I used the custom XBMC build-in functions as work around.

2) In list mode the "watched status indicators" are not shown, only when the files themselves are displayed. Is that supposed to do that?
It is annoying if you have the season screen (season 1, season 2, ...) in viewtype: list. You can't see which are totally watched. When you switch to any other viewtype they are shown. Can this be added? When you click on a season and see all the episodes in viewtype list, the indicators are again shown.

Otherwise: very very pleased with it! And very fast on my old mac mini!

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Is there any background image sets to replace default? I mean when scrolling through home menu for example to have different backgrounds for TV Shows, Movies, Settings, etc.

You should have found it by now
Like you said, if you go to: Skin Settings > Setup the Aeon Nox main menu > Movies or Videos or Music or any other
There you can change/choose the background of all the menus, also your custom made ones.