Symmetry constraint should be able to work by selecting a point, not just a line.

[OmegaZen_]

I shouldn't have to always draw a line to select symmetry when a point can do the trick.

[samanthalynnwatkins]

I'm just curious, with a single point the symmetry could not be technically defined without some other kind of line, another point, axis, or plane. I would think somewhere there should be something defining an  angle for the symmetry.  Just my thoughts.