Dock Bookmarks panel + open new repo using same window

SourceTree does an excellent job of visualizing and managing branches in a single repository. But when working with multiple repos, you end up with many windows and it's very cluttered.

My idea is to offer a simpler view (along the lines of GitBox) of your repository list in the main window, along with the ability to switch repos without having to open new windows. Maybe this could be accomplished with a tab for each repo, or maybe it's as simple as showing only the repo you selected in the bookmark list.

For users like me who work with multiple repos, this would increase the usability of SourceTree.

On a sidenote, I'm not sure why this is called a Bookmark list. This is, to my understanding, the list of the repos you are managing with SourceTree, so why not call it Repositories?