If you're able to upgrade to 7.5 I think the easiest way to add views that are similar to the EditPanel area would be to use a Custom View.
Read more in Duong Nguyen's blog post http://world.episerver.com/Blogs/Duong-Nguyen/Dates/2013/12/Custom-views-and-plugin-areas-in-EPiServer-75/.
I'm trying to create a custom tab in edit mode in EPiServer 7. This was possible in EPiServer 6 using a plugin in the EditPanel area. I've read various articles about the dojo framework but can't find an example on how to add an addtional plugin in a custom tab.
Is it possible? If not, where can the dojo framework be used to extend the UI? e.g. tools dropdown etc.