New update, pretty sure it's the last for a while.
https://files.catbox.moe/7n2y3d.zip
List of changes:
Changed bone lenght to bone radius to resize controllers for the armature method
The Mesh mirror method now cuts across the local axis of the object by default. added a checkbox option to choose world axis
The mirror modifier now uses the world axis to mirror the mesh if the mesh was cut through world axis