I had to look that one up.
"QFF is a Q code. It is the MSL pressure derived from the barometric pressure at the station location by calculating the weight of an imaginary air column, extending from the location to sea level, assuming the temperature and relative humidity at the location are the long term monthly mean, the temperature lapse rate is according to ISA and the relative humidity lapse rate is zero.
QFF is the location value plotted on surface synoptic chart and is closer to reality than QNH, though it is only indirectly used in aviation."
I'm inclined to agree that airfield QNH is more useful than QFE. The point of the post was to question the wisdom of aircraft in a small area using different QNH settings.
(I DO understand altimeter setting procedures, and I'm not too lazy to change the setting...)