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Would be nice for redirect scripts for custom importers, there isn't anything specific to vBulletin in this option class, so putting it in core would just help remove the need to copy and paste the entire class
Actually, while digging through it seems like a good portion of the vBulletin importer could be included in the core as abstract classes or traits (redirectContent inside \XF301VB\Pub\Controller\Redirect, for example)