If you have a character that the auto bone detect does not work properly, fixing the position of the bones is next to impossible.

since all movement is 'screen relative' , a small / slight movement in screen space ALWAYS ends up moving the bone significantly in the 'depth' of the scene, so trying to do small corrections of a hand bone for example basically becomes impossible.

For example, the thumb bones in the image attached, I literally CAN NOT fix the placement, because moving any of the bones in screen space ends up with the bones way off in space below / behind the direction that I'm actually wanting to move them.

This basically means that this tool is fantastic WHEN THE AUTO DETECTION WORKS, but otherwise it's basically useless.