Empty as cylinder and other

Right now user not have a Empty as cylinder in case exist circle, cube, etc. docs.blender.org/manual/en/latest/modeling/empties.html

• in opinion Empty as cylinder can be good anchor for bones or other robotic rigging, in case cylinder representing rotation plane in some DOF

en.wikipedia.org/wiki/Degrees_of_freedom_(mechanics )

• it should exist some special empty as "rotation" symbols and for "location" or "scale" also (related with gizmo symbols and icons, eg. blender.stackexchange.com/questions/258708/how-to-make-chest-and-hip-bones )