Here is a situation. I use deoplete but since the pop-up menu when I type in something already puts the cursor at the first item on the list, when I type in return, it inserts a new line.
So I want to type in return + shift to insert a new line (move the cursor to the next line on insert mode) and typing in just return key adds the completion target.
Is this possible? I use neovim 0.3.1.