Yes, copying into multiple rows is indeed a very wanted feature.
In my scenario I often need to multiple copy let’s say 6 or 7 fields from one row into new rows (not few, but hundreds of new rows) and then add the rest of unique data to these rows.
Right now CTRL+C/V shortcuts are my best friend 
For such a situation maybe duplicate row feature could be enhanced too: instead of make just one duplicate there could be the option to set a number - how many duplicates I want to create.
Just an idea…