New answers tagged quick-launch
I assume you are using the CSS to just customize the branding of the left navigation. If so, you will be able to apply it for all application pages by simply adding the custom CSS to the current masterpage for those pages and making sure you are overriding the sharepoint left menu navigation control styles through your custom CSS. Here are some good ...
I couldn't find any option in the webcontrols that could highlight the current page. I used JQuery selector to apply style as shown below. Solution very specific to my scenario... $('.ms-core-listMenu-verticalBox .ms-core-listMenu-root > li > ul > li > ul > li.selected').css("background-color","#CEEDF9");
Not sure if this is the same in 2010, but in 2013 I often use Audience Targeting to display quick launch / global navigation to only certain groups of users. https://technet.microsoft.com/en-us/library/cc261958%28v=office.14%29.aspx
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