No, it's just not something I have ever found the time/interest to implement.
The MOBI metadata code was not originally written by me, which makes modifying it to deal with joint mobi files painful. And then MOBI is a reverse engineered format, which means that every time I make a change in some aspect of MOBI handling the only way I can validate that change is by creating lots of test files and uploading them to a Kindle and seeing what it does.
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