I wrote:
But in general although if we developers don't need this button we
should consider the users needs. From time to time there are questions
how to create a new line in the same item. We use Ctrl-Return, but users
don't want to learn shortcuts. If a user don't use LyX every day he will
surely have forgotten that he has to use Ctrl-Return.
So although I don't use it I think its useful for many users.
Therefore I named the button not "linebreak" but
Item "New line in same item" "break-line"
regards Uwe