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7Z can compress in several ways,
You can set the compression level from 'store' gradually in 5 steps to 'ultra'.
It still uses a standard zip encoder.
You can set word size, etc.. But I don't know if it'll affect epubs.
So far I've opened existing epubs with 7z, and added/updated some existing files within these epubs.
I don't think 7z supports compressing one file as store, while the others as a compressed format. it probably will want to compress all files (including mimetype) or compress none, depending on how you set the compression level.
For that reason I open and just update an existing epub rather than create a new one.
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