Again, by installing calibre you gain the ability to not just use it, but also modify it. Therefore, the GPL's copyright clauses are not the only ones applicable. If you modify it you must abide by the terms of the GPL, and therefore accepting the GPL is necessary. If you feel that you want to modify it but cannot abide by its terms, then do not accept the GPL and do not install it.
So no, I will not accept a patch to remove the checkbox.
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