I would like to see the creation of all "Construction" types be under ONE creation dialogue for each of the Construction tools. One dialog for creating Planes, one for Axis, and one for Points. You click on "Create Plane" and then the dialog offers all the different methods to do this.
The big advantage of this would be when you need to redefine a plane by a different method than what you originally used. As of now, if you want to redefine a plane as "Plane at Angle" and you had made it an "Offset Plane", you have to delete it; create the new one; and then reroute any sketches or splits that used it to the new plane. A time suck.