Clone similar stories in Paths with improved editing

Hi,

For the development easiness, I see following enhancement 

1. Copy-paste support for the path → If the path activities can be copy - paste to avoid rework on similar activities.
2. Deletion of the path steps without affecting next activities in line → Right now the if you delete anything within the path, It would delete all the other activities in the stream.
3. Activity for js manipulation → JS script executor would be really helpful for data massaging, validation and error handling

Regards,

Rajeev