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i have rar & 7z, but that sort of work-around will confuse the database integrity checks,
Once calibre sees that original_FMT has been deleted, it's not then going to know that it is back again when manually extracted from the rar or via a rename. Maybe a library repair will pick it up again but what a rigmarole, compared with turning on a select epub as source format conversion option.
Even though in practice, I've not ever really needed the library mainenence tools, why deliberately do stuff that will mess them about.
Luckily I mostly prefer reading my books on Kindle Fire in their epub format via mantano app, vs reading an azw version in the native kindle app, so this is an user-choice-principle argument.
(I can't customise left handed page turn controls in kindle app , like I can in Mantano)
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