Basically, Sigil 0.4 will retain the original ToC from the ePub (you no longer need to change headings that use paragraph tags to <h1> etc if you just want to do a quick edit). It allows the .opf and .ncx files to be edited manually and allows you to fix xml errors manually instead of trying to fix them automatically (which would often cause large chunks to be deleted).
All the issues that I know of with chapter splitting have been fixed.
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