Not sure if it’s a bug, or something has changed in Unity 5, but I can’t seem to edit the vertices, other than moving the given ones, and deleting them, I can’t add vertices at all. I tried holding shift, there’s not sign of it adding a vertices at all.
Forgive me if I didn’t google enough, just in case there’s already a solution somewhere.
##Polygon collider 2D Workaround##
Now i don’t have a solution to getting the shift+click to work but,
If you go to the Polygon Collider 2D inside the inspector:
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Go to points handle
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Then Paths
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Then Element 0 (or any other Elements)
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There you can increase the Size value. This increases the amount of vertices.
(increase it to a larger value. Deleting any excess later on)
*Note you have to move the vertices to see then the new ones will be created on the exact same location as the first element.
This way you will at least have plenty of vertices to work with: