thats the root joint isnt it...that should be straight.

When I create the leg joints I usually have the joint orientation on the joint tool set to none, but on the root and all the way up the back I have it set to xyz. The pelvis joints are also set to xyz...then I simply parent the hip to the pelvis and then the pelvis to the root on both left and right sides of the skeleton. The roots orientation is perfectly straight and doesnt require any edting of the rotational axis

hope this helps
Jay