A quick tutorial on how to add a finger control bone, basically what this does is it bends all of the fingers in unison (except the thumb, you'll have to bend the thumb manually).
Link to the PMX editor that I used: http://www.mediafire.com/download/fexrcquj2k26srg/PmxEditor_0219%28english%29.7z
Link to MMD: http://learnmmd.com/downloads/
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PMX Editor/MMD Finger Control Bone Tutorial | NatokHD