More than a dozen of settings aiming at creating a friendlier administration environment for both Administrators and Editors.
You can enable the following shortcodes:
It is up to you to decide whether you will use your theme's options or those provided by this plugin. It is recommended, though, that you keep those settings separated from your theme and the reason is simple: If at some point you decide to switch themes, those options will be lost and you have to remember to re-enter them. Keeping them in a plugin maintains the options between themes.
Generally speaking, no. WordPress' default behaviour is probably the best, that's why the specific option is disabled by default. In some cases, though, users might get confused with those notifications or think that something is wrong with the website. In cases like that, you might want to keep the update notifications visible only for those who can apply them - namely the administrators. Keep in mind that, technically, selecting this option won't remove the notifications for the non-admins - it will just hide them with CSS.
Sometimes you only use certain features of WordPress. For example, your website might have comments disabled or not using the Links feature. Also, for better usability you might want to show your users only the options that concern them. Hiding those options won't remove them. You, as an administrator, will always see the full list of all the available options. An editor, though, won't see the hidden options, which helps him focus to only those that concern him.
You can allow editors access to one or more of the following sub-sections of the "Appearance" section:
This is a known issue. When Page Caching is activated in the W3 Total Cache plugin, the old browser warning becomes unpredictable and it may appear not only in Internet Explorer 8 but in newer IE versions as well as in Chrome. To deal with the problem you need to disable either the old IE warning or the W3TC Page Cache option.