You posted in the Media
Center board, but you're talking about Media
Jukebox, right?
Theater View is a view that allows you a comfortable usage of Media
Center on a TV and makes it easier to control Media
Center with a Remote. It's not integrated in the free Media
Jukebox version, so you will not find it there
Also, I wanted to know if MJ has an option/feature like another program's File Monitor(to find any changes/additions to the media files in a folder and subfolders, and automatically add them to the library.
For this you may take a look at
File -> Library - Auto Import Options There are some options available which can do and configure this job. For other jobs
For me, MC and MJ are very complete without any plugins. The only thing I never would miss is the ugly looking but good working sleep timer plugin available at the MC/MJ Plugin download page. It can shotdown MC/MJ and/or windows after a time you can set or just stop playback after a specificed time.
You also may have a look at KingSpartas Data Master if you are looking for a tool which can download (and upload) lyrics, bios and many more fields (e.g. charts).
For coverlookup and download no plugin is needed. You can rightcklick any audiofile within MC/MJ and select
Cover Art -> Get from Internet.