Awesome

br.summernote.js

Summernote Editor Linebreak Plugin

Simply add file to your preferred javascript folder and load it after loading summernote editor plugin

<script type="text/javascript" src="/js/summernote-lite.js"></script>
<script type="text/javascript" src="/js/br.summernote.js"></script>

No initialization needed anymore

Press SHIFT+RETURN-Key at the same time, when editing your text. Have fun.

Version 0.4 got the option to prefer soft-breaks.