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To clarify the terminology: Microdata is a syntax. Schema.org is a vocabulary. (And such a vocabulary can be used with different syntaxes like JSON-LD, Microdata, and RDFa). Your two example snippets are correct. And your observation is also correct: BlogPosting doesn’t define any new properties. […] can I use the properties from other item types like: ...
Sure, cross-domain is fine. Using .mobi was very popular for a while, other sites just use "m.theirdomain.com", it's essentially up to you. Keep in mind that multiple domains for the same site does increase the maintenance overhead, but that's ultimately your decision.
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