One of the cool things about CFEclipse is that it's built on Eclipse ... just incase you didn't know that. But with this also means that across all my perspectives (perspectives for non Eclipser's are the equivalent to seperates IDE's) you share shortcuts.

As with all editors there are tons to discover or if you like read-up on and a new one I've just stumbled across is for a complete line copies only ... as if command+c then command+v isn't easy enough anyway.

With your cursor on the line you want to copy use Alt+Command+Down Arrow. You can also select multiple lines and use the same combination as well as using the Up Arrow to copy upwards.