[Mudislander]

@charrua72 - Re question #1 it's way too early in the morning for this question Just got back from AM workshift & brain is tired. It's easy to setup 2 main menu playlists and then give them their own submenus. Use the addons and playlists submenus and change the submenu set for those main menu items. You'll probably have to change other Main Menu submenu sets to something else to stop your "Anime" submenu items showing up where they're not wanted.

The problem I can see with your question is the main menu item of "Anime" as I'm not sure how happy a playlist would be trying to list all anime (movies + episodes) and on top of that the script that grabs the content for the home panel may have problems with mixed content type - Something I'll check on.
ATM you can't seperate the Addons like that.

#2 - We haven't added in support for genre backgrounds yet. I'm sure one of us will get around to it fairly soon.

#3 - I'm looking at the addons, as I'm not too happy with them, but I do think to start having specific menu related addons eg music/movies etc maybe pushing it a bit too far on resources used

Edit

You need to look into Video Library ReOrganization and the wiki page Custom Video Nodes