There is a setting property in the wlwmanifest.xml depending on the feature. Please note that setting this value to true will allow the <!--more—> tag in your WLW. The collection page and simple entry partial were modified to have a "Read More" link whenever there is extended content.

Live Writer has built in support for splitting entries as seen in the picture to the below.

extended-content

Also you can see the more features integrated with WLW, for example, keyword, category and slug etc. :)

Blog Settings In WLW

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