Nihar,
I think in your first question you are asking whether there is a way for libflame to call BLIS APIs directly, rather than libflame utilizing BLIS via the BLAS interfaces. The answer to this is no; libflame only uses BLAS.
I'm not entirely sure what you are asking in your second question. BLIS has supported architecture-specific builds since its inception. Please run './configure' with no arguments to see a list of supported configurations.
In the future, we ask that you post to the BLIS forums when posting questions that relate only to BLIS:
https://groups.google.com/d/forum/blis-devel
https://groups.google.com/d/forum/blis-discuss
(For questions that relate to using them together, posting here is fine.)
regards,
Field