It seems that Jim Salk places a high value on even frequency response and phase integrity in his designs. To achieve his goals, in general, seems to require fairly complex crossovers of rather high parts count, High parts count is the enemy of high sensitivity due to insertion loss (am I wrong here?). So, you are basically asking him to stray from the core values he embraces by requesting high(ish) sensitivity. I wonder if he would really be able to commit and put his heart in it.
I have a friend who once owned Salk for a few years and then decided he wanted to dabble in the waters of high sensitivity and moved on to Daedalus (where he remains today on his second pair). He sold his Salks to a work colleague and that person has since moved on to a second pair of Salks. Both are currently happy campers. I have been to these guy's homes on more than one occasion, heard the systems, and have certainly enjoyed both presentations (in vastly different settings but, in both cases, powered by tubes although the Salks have recently been repowered with SS). Both speakers feature beautiful woodwork and I believe the Daedali are solid wood as opposed to veneer but I have to say that the Salks seem to be the more professionally rendered finish while the Daedali appear to be more of "made in the garage" type product. This implies nothing about their sound and, Tom, please don't hate me for saying this...it's just the way I truly see it.
Sorry if I got sidetracked a little back there. My point is, there are plenty of builders out there already who fully embrace the high sensitivity approach and I think you would be better served to proceed in that direction than to try to coerce Salk into building a speaker that eschews his core philosophies about what disciplines need to be incorporated into his definition of a "proper sounding high performance speaker". Now, having said all of this, maybe Mr. Salk will come on board and proceed to blow up my whole hypothesis point by point. I will certainly listen.
Just one more thing...92-93db sensitivity into 8 ohms certainly trumps 84-86db into 4 ohms but it still isn't truly high sensitivity, FWIW.