ADE/RMDSK does not support soft hyphens. So it's not worthwhile to make a hyphenation plugin for Sigil. If you are making/editing an ePub for the source to a KF8 eBook for a Kindle, you can use the Hyphenate This! plugin with Calibre. You do not want to add soft hyphens to an ePub. It will just cause more problems then it's worth. Plus, searching will break as well. So if you go to search for words in Sigil, it won't work.
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