That's just it. Unless you change equipment, your crush, or process, your efficiency will be pretty much the same across the board. You can then use that efficiency in Beersmith to formulate recipes or to duplicate recipes' target gravity simply by changing the amount of the grains in the mash. Play around with that screen. Change the efficiency number and you'll see the corresponding change in estimated gravity. The same for keeping the efficiency constant, and changing the grist amounts.
The difference between Total Efficiency (Brewhouse Efficiency in ver. 1.4) and Mash Efficiency (Efficiency into the Boiler in ver 1.4) as I see it, is that mash efficiency is simply how much sugar you leave behind in the grain and/or dead space. Total efficiency includes all losses (BK deadspace (if any), cooling loss, pump/lines/chilller, trub loss, etc.) and includes the volume and OG of what actually makes it into the fermenter. As for what people are reporting, I'm not sure. I get ~62% Brewhouse Efficiency. My mash efficiency is usually tad higher. Again, this is for the earlier version of Beersmith, there should be a better definition in the Help Section of the Efficiency sub-screen.
