I've thought that would be nice too.
But, as you point out, I expect that Adobe makes that hard to do.
unless ... there is a "save preview" feature/option that has been invoked when the .pdf was created (similar to M$ office products). Then I expect that x2 could(would?) display the preview,
Why don't support TC(WC) or FAR plugins, once for all.. crazy things one wants? ;^)
Most expect x2 to be swift & nifty (and usually dislike bloatwares) ;^/