Idea/Question: Could we add a new API on hs_stream_t to tell whether need more data to do match?

Consider a network rewrite scenario, in order to keep less network packets, after the call of hs_scan_stream(), we need to know whether inputed stream can be sent(which means no need to rewrite inputed streams) or not.
Could we add such an API on hs_stream_t to achieve this?