Finally my friend Ilgar Lunin made this amazing rotation tool! It is really super comfortable not only for animation, but for placing objects as well!
This is a big problem right now to animate controllers with a default rotation gizmo. This tool can rotate multiple objects in their own local space. Also it has a sphere shape of gizmo like in Autodesk Maya, for example. So the user will need to make only one move to rotate the object in the right position, instead of moving each axis separately.
Please check out this forum thread for more details.