#1 - constantly in progress. As with any other relevant parameter, I'll add it to mlnx_tune once there's a solution.
Regarding the documentation, next mlnx_tune version should be out by EOM September. I will update the mlnx_tune entry with recent changes and will expand upon the existing profiles.
Until than, mlnx_tune as a static system analyzer is good for both Ethernet and IB. The tuning part is currently only good for Ethernet, mostly because IB has excellent out of box performance.
Again, thanks for your feedback. It is highly appreciated.