Now, I can only drag&drop directory to central pane of program (in Repository Manager it adds repo, in repo view it opens repo).
It is working but not very intuitive.
I propose to allow also drag&drop also to any area of app (i.e. also repositories list - left bar of Manager) which should just add repository on Repository Manager screen or open repo in other.
This should also fix some nondropable areas in Repository Manager (last Readme.md content) or repo view (commit title or author).