User blog comment:Kirkburn/Rich text editor upgrade news/@comment-473563-20091220025959

Shift+Enter is a "shortcut" adopted by common word processors (e.g. MS-Office and OpenOffice.org) as well as some online rich text editors that I have seen. It is especially useful when you want a line break but don't want to create a new paragraph or a new item in an enumerated list. (It is also useful inside a table cell to cause a line break without advancing to the next cell in the table.)