1. Normally if there isnt choose a slider for the page there should not be a frame of the slider (Page options in the settings box below the slider when you edit a page -> slideshow tab)
2. This option is only working if you’ve not set a background for the sections (header, main, footer). This option will overwrite only the default body background. If this is not working the please send us (info @ 7theme . net) the link to you website, then we can take a look at it.
3. You can take a look at the source code, all pages have a unique classname, for example …body class=’ … postid-1234 … ‘, with this selector you can add a custom color for only this page
4. No, normally all shortcodes in the theme are in the shorcode generator (button in the editor when you edit a page)