Insert row is: 1) Shift + space (highlight current row) 2) alt + I (open insert menu) 3) r (insert row above)

vs Excel which is: 1) Shift + space (highlight current row) 2) ctrl + shift + "+" (insert row above)

Slightly different key pattern, but it does exist. Difference probably exist b/c ctrl + "+" is reserved in the browser for zoom.