Vintage mode missing paragraph selection

Vintage mode seems to be missing "inner paragraph" text objects (though it does have "a paragraph" text object).

e.g. commands like vip, yip should select/yank the paragraph.

In various LaTeX packages, an additional text object "environment" is added (ae/ie) to select the contents between \begin{env} and \end{env}. I can't see obviously how this would be extended, but that'd also be very useful