Better Code Complete

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So I've been using  IntelliJ for around three years now, and have loved every moment of it. However, I think there is still quite a bit of room for improvement regarding code completion. For example, changing a class to an interface should probably automatically replace implements with extends, and public to default for methods. Another one that gets to me is semicolon, way back when I used Eclipse hitting semicolon would automatically put it at the end of the current line after closing any unclosed parens, but I haven't found an option for that kind of function for IntelliJ yet. Does anyone know of any plugins that might be able to help me out, I can't help but think other people might be looking for features like this? 

Thank you so much ~ Jonathan Z