Inserting Many Rows in calc with a simple procedure, ie. in the insert row menu/icon/context menu item a No. of rows field shall be added and on entering the number and clicking some Ok Button or so, that number of rows should be inserted. 

As of now, suppose we have to copy 2000 lines the data from some other spreadsheet file, we have to painfully, drag 2000 lines and then right click the row and select the insert above or below option.  Instead of that what I suggest is to select a row --> right click --> enter number of rows in a field (it should be default to 1) --> then our present option ie Above or Below --> finish it.

Inserting 2000 lines is truly a tedious process now.