Hi Richard,
I'll go along with the comments of the other list members. To put both of our minds at ease, I checked my old Stronglight catalogs and there was no mention of torque specs - for anything. Also, the only crank bolt tool supplied by Stronglight (well into the '80s) was the simple old socket through which a 120 mm x 7.5 mm rod passed. I guess they wouldn't have expect that "too much" torque could be applied by hand with just the fist full of that rod which extended out from the socket.
I wouldn't be afraid to grease ANY tapered spindles since the tiny amount of residual grease is not going to cause the spindle to slip. Remember, this is a "pressure-fit" so, (once tightened) any slight bit of lube remaining is really going to be only enough to prevent seizure between the alloy and the steel - which occurs at a microscopic level... regardless of how much grease you might have slopped onto the flats initially (IMO).
One habit I seem to have acquired was/is to re-check the bolts after maybe 100 miles of riding, just in case they may have loosened slightly... because of vibrations on a newly seated spindle (since no split lock washers are used in this application), not because of lube.
Ciao!
Bob Hanson, Albuquerque, New Mexico, USA