Hopefully sometime in the future you'd be able to add it. Even something as simple as "uncheck all engines that do not create subdomains" would be good enough, like you already have for uncheck all noncontextuals and uncheck all engines that are nofollow.
Yep, I have them too. It's just that some of their engines don't create subdomains and some do so it requires some testing and analysis to figure out which ones to pick for subdomain creation.
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Hopefully sometime in the future you'd be able to add it. Even something as simple as "uncheck all engines that do not create subdomains" would be good enough, like you already have for uncheck all noncontextuals and uncheck all engines that are nofollow.