Cut loop to two equal parts...

[Arg Arg]

individual workflows needs individual solutions, so it is good that a user is able to reach the goal
with the tools wings is offering.
ok... it´s not a command... it´s just my way i would solve your problem in wings.

but if there is still not a plugin-command to do the job... it´s good to have a "workaround-solution" like that

of coz... increasing numbers of edges leads to a time consuming work if you make use of
measuring and moving.
i have not found any solution in wings which do the job faster like this one, i posted here.
hope it helps... till anybody builds a plugin... maybe CUT RMB (calculated by the total lengths of all edges)