Copy & Pasting Cells in Library Editor

If I single click a cell and select Copy and then in the row beneath select the next cell down and click Paste then there is no copying and pasting going on.

I have to click in the cell and select the entire text to copy then paste.

It'd be nicer to click once on the cell and copy and paste.

Also it would be nice to click once a cell above, drag the mouse down to highlight the cells underneath, then select paste to fill down the column.

Another great feature would be to right-click in a cell and have "Apply to empty cells in column" and "Apply to Column" on the menu to quickly fill columns.