This script will simply let you divide a bone.
Post Hierarchy Options:
Create Hierarchy - Will link the newly created bones forming a hierarchy.
Parent to Original - Will link the newly created bones to the originally selected bone(s).
Retain Parent - Will link the newly created FIRST bone to the original bone's parent.
Retain Children - Will link original bone's chidlren to the LAST of the newly created bone(s).
Replace Original Bone - Will delete the original bone(s) after creating the new bones.
Divisions - the number of division/segments you want for the bone(s).
Divide - Will execute the division of the bone(s).