by RobBaer » Sat Jun 24, 2017 3:34 am
This is done in a downstream program of your choosing. It can not be done in MH skeleton debug which is a utility included in build versions for viewing weight painting, not rotating joints.
For example in Blender you might select the bone and hit the R key. Using local rather than global axes can sometimes help. If you import with the mhx2 control rig, I believe you can hit s with the finger control and move all the bones of a finger together.