Maybe already is there a solution or script or something ( i did’t find it here yet) but in sketching or quick modeling stages, could be usefull to make arcs starting from the mid point and then, defining the ends simmetrically, something similar to the Parabola or hiperbola behavior as you can see in the attached image:
I found this script from Mitch and Vittorio
[Arc - BothSides?]
Tested both versions and still have to define the center first.
I think it like the circle from diameter and then trim it?