I would love a drawing tool to create catenary curves. This would allow for realistic depiction of hanging chains and catenary, self supporting arches.
Others have suggested a formula for using a equation: https://forums.autodesk.com/t5/inventor-forum/equation-for-catenary-curve/td-p/3763129
. . . but for those of us who might struggle with that process a catenary curve option would be wonderful, and it does exist in some competing products such as Rhino 6.