Redesigning teaching practices?

I have read in more than one source that programs for HLL lack a standardized methodology/approach of their own. Take as an example Valdes 2001: "What is needed in order to support this growing interest in developing heritage/immigrant language resources is a coherent body of pedagogical theories about what can be
accomplished in a classroom setting relative to out-of-school acquisition, functions, and rewards." Since there aren't yet national/state standards regarding methods/approaches to better teach heritage background students, can we assume that there is no interest in this group or that standards for SLA apply to this group as well? How far beyond the focus on the 5 Cs: Communication, Culture, Connections, Comparisons, Communities can we go when teaching HLLs?