Dock Bookmarks like in Windows

SourceTree is a gread tool when it comes to Git.
Hoever if one uses one git repo for each module of an application it is important to be able to switch very fast between these repos and see if other repos have any changed while working in one.
SourceTree for Windows solves this problem very good with the docked bookmarks / repo browser on the left hand side.
This feature is still missing in SourceTree for OSX which is a major drawback.

Would it be possible to also add this feature to the OSX version?

For more details see: https://answers.atlassian.com/questions/252890/dock-bookmarks-in-osx